Hello and welcome back, Mugen 1.1 is more demanding on the PC, but well worth it, diffrence between the two is that 1.1 has PNG support and zoom (if the stage can take it) you should always run 1.1 in opengl
Here's a video of what I mean.
Spoiler, click to toggle visibiltyThis is running at 1280x960.
Example of the Zoom system.(mind you zoom is iffy as hell)
Spoiler, click to toggle visibilty
If you just want to have fun,avoid all hassle and play go with what you know.
Just update your chars. You should be able to run any char at any resolution. Most of these HD chars require 1.1 cause of the 32bit PNG support. If you plan to play with them go for 1.1 cause its mandatory, if you dont plan to play with chars like that, use what you like everything should work on any res.
To be honest zoom is whatever, the only REAL benefit of 1.1 is that 32png support, that means, HD screenpacks and stuff.
But as I stated, you will need a decent PC.