When comparing Namecheap vs GitHub Pages, the Slant community recommends GitHub Pages for most people. In the question“What are the best website hosting providers?” GitHub Pages is ranked 1st while Namecheap is ranked 15th. The most important reason people chose GitHub Pages is:
One of GitHub's features is a very powerful web editor which helps users edit or even create files right from the web browser, once the file is saved it's the same as a commit. Coupled with pages, this tool becomes even more powerful, giving users a free CMS that is easy to use and create.
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Pros

Pro Low prices
Domain registration at Namecheap is economical, as their name implies.
Pro Great support with 24 hour live chat
Namecheap support is available 24 hours a day, every day of the year. Their support is provided over live text chat, which has a lower barrier to entry, faster connection, and allows you to communicate easier than other the phone.
Because most of the support you need for domains require you to provide text configuration data, live online messaging is the most efficient way to get fast support. It also does not require your constant attention so you don't have to waste time while the operator is researching an answer for you.
Pro Free subdomains
Namecheap allows you to set up 198 subdomains for free, and also provides wildcard subdomain catching so you can manage them yourself.
Pro Free e-mail and URL forwarding
Namecheap allows you to set up 100 virtual email addresses per domain, as well as catch all forwarding all undefined addresses.
Pro Supports credit cards, PayPal and adding funds to your account separately
When it comes to paying for domains, Namecheap supports all common payment methods. For most people this will be credit cards and Paypal, but Namecheap also has an option to add funds to your account separately.
Pro Free dynamic DNS routing
Pro Strong Anti-SOPA stance
Namecheap took a stand against SOPA.
Pro FreeDNS for outside domain
Namecheap offers a free and premium (w/ SLA) DNS hosting service for domains registered with other registrars.
Pro Free WHOIS privacy protection
It's active for one year.
Pro Bitcoin payment support
Pro Expiration grace period
Namecheap will notify you if your credit card is going to expire, and has a 27 day non-guaranteed grace period for renewal.
Pro Two-factor authentication
Pro Proactive support
Not all registrar care, but when there's an error or something held up the registration they've always at least gave it a shot without prompting. This is done in a proactive way, which isn't seen very often at all. This way the user can be hands off and not need to deal with certain issues as it is taken care of in the background by their support. User is still informed, of course, but can be entirely hands off, or not, but usually they've been efficient and transparent.
Pro Free .me domain for students
Through its NC.ME program, students can get a free 1-year registration on the .me TLD and discounts on .com, .io, and other TLDs along with Namecheap Private Email hosting.
Pro The ability to create and edit files on the web UI gives GitHub pages the same power as a small CMS
One of GitHub's features is a very powerful web editor which helps users edit or even create files right from the web browser, once the file is saved it's the same as a commit. Coupled with pages, this tool becomes even more powerful, giving users a free CMS that is easy to use and create.
Pro Supports Jekyll
A simple, blog-aware static site generator, Jekyll makes it easy to create site-wide headers and footers without having to copy them across every page. It also offers some other advanced templating features.
Pro Supports custom domains
A custom domain can be added by creating a CNAME file with the necessary domain in the root of the repository and adding/changing corresponding DNS entries.
Pro Free tier
Static websites can be hosted on GitHub Pages for free as long as the repository is public. Private repositories start at $7/mo.
Pro Allows for all the git features when building your site, too
Cons
Con Misleading pricing
For example .me domain registration costs 3$ a year, but a continuation for 2 years cost 30$!
Con Expensive
It costs a lot of money to renew and purchase a domain. It also costs for their premium dns. They used to be cheap, but now it's so expensive.
Con Unable to set cache expiry, must accept GitHub defaults (which are short)
Low cache expires - GitHub sets the cache-control: max-age header to 600 seconds, or ten minutes. Normally, you would set this value to a year so that it stays cached, and then use fingerprinting on your assets. Instead of serving style.css, you would serve something like style-62c887ea7cf54e743ecf3ce6c62a4ed6.css. As it stands now, assets are rarely going to be cached on repeat visits.
This will give a low score on https://developers.google.com/speed/pagespeed/insights with a 'should fix' recommendation around 'Leverage browser caching'.
For a high traffic site this may have implications
