I'm having major OS glitches and Axe problems. This 9isn't an error report as much as it is me somehow accidentally corrupting my OS. It doesn't usually have problems, but lately, every time I close an app, it defragments. So...I'm going to wipe the flash chip, then I'm going to download an OS to my Ti84+SE.
Your mission, Omnimaga: (dramatic music cue)

Tell Dapi what the best 84+ OS is. Which do you prefer, and why?

2.55MP. Before you bash MathPrint, let me mention some features added since 2.43. They may not help you, but they won't hurt you either:

• The ability to scroll up on the homescreen and view command/response history, and to copy any item in history to the active line (works with or without MathPrint enabled). I use this feature all the time, it's great. It's so much better than repeatedly pressing 2nd + ENTER to try to find a past computation, only to accidentally skip over it and then have to go all the way back around to it. And you don't just have to replace the active line with it, you can insert it into an already partially written expression.
• More graph zoom options. I'm meticulous with my window settings so always set them manually, but if you graph a lot, you might find them useful.
• Some new math commands, like logBASE(, remainder(, and randIntNoRep(. The first two could obviously be done before with a combination of a few commands, but having one command to do it is nice. The third could not be done before, and could be a huge boon to TI-BASIC programmers. You do have to keep in mind that using any of these in a program you plan to distribute will prevent any users of OSes older than 2.53MP from running your program, but for programs/computations just for yourself, they can be useful.
• Stat wizards for more clear use of the regression commands. If you don't like them, just turn them off.

As for MathPrint, we all know it's a little slow, occasionally a little buggy, and doesn't play nice with some assembly programs/applications, like Omnicalc. If you don't want MathPrint, just turn it off. Turn it off and you essentially have 2.43, but with the added features I mentioned above. But if you do want homescreen math to look a bit neater, it's there if you want it. And despite the ridicule you may hear, 2.55MP is not inherently any buggier than 2.43, especially if MathPrint is turned off.

Finally, it's worth noting that the addition of all of these features has caused no reduction in the amount of available user archive. So even if you never use a single one of the new features, you aren't losing anything.

I use 2.53, it has all of the mentioned features of 2.55, except that I find it a lot less buggy with programs, and the stat wizards are just plain annoying.

Mostly that zStart does not seem to work very well in 2.55 and it works in 2.53, I figure that 2.55 has some hidden bug that is destroying my calc.

Well it's either zStart or thepenguin77's patches that destroyed my calc last time. But now I'm afraid to get 2.55!

The only reason I have 2.53 is that I like that I can scroll through previous answers. Otherwise I would use 2.43.

Should I worry about compatibility between apps and OSs?

fortytwo, which reminds me, what is the absolute newest version of usb8x? I can't find any higher than 0.95