When comparing Boat vs Photon, the Slant community recommends Photon for most people. In the question“What are the best Android web browsers?” Photon is ranked 26th while Boat is ranked 28th. The most important reason people chose Photon is:
In flash mode you get remote access to desktop Firefox on a Linux server. Unbeatable desktop web compatibility on Android.
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Pros
Pro Flash support
The browser can play Flash videos, Flash games, etc.
Pro Floating tabs
You can open a page as a floating window, you can open as many floating windows as you need. The windows can be individually resized and positioned wherever you want. The window can float on top of other applications as well.
Pro Functionality can be extended via add-ons
You can search the play store for "boat borwser addons" to find add-ons for social media, productivity, etc.
Pro Built-in QR-code scanner
Pro True desktop browser experience
In flash mode you get remote access to desktop Firefox on a Linux server. Unbeatable desktop web compatibility on Android.
Cons
Con No directory for add-ons
The only way of finding add-ons is by searching for them in the Play Store. There's no well organized directory available.
Con Videos are compressed twice
In Flash mode, you get an interactive streaming video of a desktop browser running on their server, but this means that when you watch videos (a major use case for Flash mode), which are already compressed, it has to be lossy compressed again to get to you, with noticeable loss of quality. So it's better to watch videos with Flash mode off if you can. There's also a bit of lag when scrolling and such.
Con Flash mode has ads
You can also get an annual subscription to turn these off, but it's $10/year. That's kind of pricey when you can get Puffin Browser Pro with unlimited service for a single payment of $4.