When comparing Adobe Illustrator CC vs Nitro Pro, the Slant community recommends Nitro Pro for most people. In the question“What are the best PDF editors?” Nitro Pro is ranked 8th while Adobe Illustrator CC is ranked 9th. The most important reason people chose Nitro Pro is:
Nitro offers a cloud-service, called Nitro Cloud. Nitro can upload a PDF to the Nitro Cloud and notify other people via email that they can either view or edit a PDF or have to sign a PDF. If they need to sign a document they will be able to do it from the interface that's provided by the Nitro Cloud.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Amazing integration with all other Adobe Software (PS, Ae, Id...)
Pro It's the industry standard
Pro Advanced tools
Pro Has all the vector tools you could dream of

Pro Flexible, non-intrusive interface
Small palette menus and the ability to save multiple menu layouts keep the UI out of the way.
Pro There are many tutorials on the internet

Pro Frequent updates
The CC subscription model means that major releases are no longer necessary, so existing users gain immediate access to new features.
Pro Easy to learn
It's easy to learn how to work with this software.
Pro Nitro Cloud simplifies sharing, collaboration and getting documents signed
Nitro offers a cloud-service, called Nitro Cloud. Nitro can upload a PDF to the Nitro Cloud and notify other people via email that they can either view or edit a PDF or have to sign a PDF. If they need to sign a document they will be able to do it from the interface that's provided by the Nitro Cloud.
Pro Clean, ribbon-like user interface
Nitro Pro has an interface that will be immediately familiar to anyone who's used Microsoft Office products.
Pro Can directly convert Outlook e-mails to PDFs via a plugin
Single messages, conversations and folders can be converted.
Pro Good support for e-signatures
Nitro allows signing a document in three ways - using a webcam, writing it by hand or adding a signature from a file. It also allows you to send out files for signing via their cloud service, Nitro Cloud.
Pro Reasonable OCR capabilities
Pro Super-simple MS Office file conversion
To convert an MS Office file to a PDF, simply drag and drop the file on the Nitro Pro shortcut.
Pro Allows combining PDFs
Pro Allows batch printing multiple files
Pro Offers a trial version
Cons

Con Subscription model
Illustrator CC requires a $19.99/mo (minimum) subscription to use. Adobe no longer sells previous versions of Illustrator.
Con Heavy use of CPU/RAM
Con Steep learning curve
Con Very slow
Even in very good computers Illustrator is very slow.
Con You never truly own this software
As soon as you stop paying you to lose access to the software. This should be illegal.
Con Install useless and intrusive software
When you install any Adobe product it also installs lots of useless and intrusive software and services.
It adds two services and up to three auto-starting software that runs when you start your operating system and keep running constantly. One is for auto-updating, others for "checking" if you are not a pirate and some others that seems to be just to collect information.
Con Imprecise coordinates
Oftentimes your 140 is 139.9997 and as a vector program it doesn't rely much on precision.
Con No proper selection mode
In a vector-art program, the critical selection mode is the one in which objects must be fully enclosed by the selection marquee to be selected. In the simple example shown here, selecting all the circles should merely require you to draw a selection rectangle around them. But in Illustrator, there's no way to avoid selecting other objects as well, even though they're not totally enclosed by the selection box. Year after year, Adobe fails to fix this bizarre oversight, making Illustrator a tedious pain to use.
Con Buggy
Software can be very buggy at times.
Con Pricey, bloated addvertising for nothing, frequent crashing
Nitro Pro is available for $140.
Con Difficult to register
Very buggy, no support.
Con Incomplete MS Office document to PDF conversion
Some attributes, like form fields don't get converted.
