I hope this isn't a complicated answer. You want the platform that has what games you want to play. Me personally I think the V32 is my favorite and has better game selection. (but I also have a 22/22)

As far as software is concerned, All Alpha 1 games (except Crystal Spider (v22/32) game will run on Alpha 2. Crystal Spider complains about the newer bios chip on Alpha 2 but plays fine on Alpha 1. Not a game worth worrying about.

If you get a v22/22 and run 22/32 game, the top screen will be sideways but still play fine. V32 runs sideways on a 22/22.

When buying games, look on youtube or ask on the forums if the game is 22/22, v32, curve, or v22/32.

If you get a V22/22 you can easily convert it to a curve, and back again. I do that with mine.

I could go on and on.. but tried to keep it simple.

Bottom line is the type of games you want to own.

Hope this helps

Looking for reel strips for S3000, Pinball or Top Dollar or both

Several of us have purchased from auto155. John's been very reliable and he sends them out quick.

You're using the 28-pin Pot-O-Gold harness for that MPU set-up.
Check the voltage coming out of the touchscreen power supply with a digital multimeter.
Check also, the touchscreen cable.

Offhand, is it a 12VDC?
If below specs, swap the power supply brick for the TS.

If nothing works, contact the Triton Gaming guys or the folks from Great Lakes Amusements.
They're pretty awesome and know all about your T340+ touchscreen

Let's  move onward to clean up the MPU, we're getting a lot completed.