If you are using PS1 Loader, you can reach the options menu via holding down the PS button and choosing settings next to your launcher game.
If you booting your PS1 games from withing TN-V, you can reach the options menu via pressing down the defined PS button on your tn-v settings. It's Select and Start combo as default.
Vita POPS has a custom screen mode which lets you resize the images via finger which i find very difficult. it is much easier to resize game screen in custom mode in PSP POPS via buttons. You have more buttons (all buttons of the dualshock including both analog sticks and R2/L2, R3/L3) to assign to front and back touch screens in Vita POPS than PSP POPS. You have to rely on button combos on PSP POPS to define all buttons as PSP does have less buttons than a DualShock. Also you cannot assign any button to back touch screen.
i haven't found any game spesific differences yet, but i believe there should be some too. This thread will be edited and include more info later hopefully with everybody's contributions.
EDIT: qwikrazor87 said there is no difference between what i called PSP POPS and Vita POPS mistakenly, only loaded modules differ. (read EDIT 2) Still GUI options for POPS differ in PS1 Loader and tn-v10. Main differences of GUI options:
PS1 Loader version is much more efficient in button remapping
TN-V10 Version it is easier to custom resize the screen since it doesn't rely on your fingers on touch screen.
EDIT 2: PSP POPS and VITA POPS are different. in VITA POPS, vita side takes care of SPU/GPU while PSP side takes care of CPU. VITA POPS is superior in rendering and compatibility.
EDIT 3: 1st scenario: We are booting a PS1 game within TN-V10. We are using what we call PSP POPS. PSP emulation of Vita takes care of PS1 CPU and GPU. as there is no SPU emulation, it is handled by the PEOPS Plugin.
2nd scenario: We are booting a PS1 game within PS1 Loader (aka TN-X beta). We are using what we call VITA POPS. PSP emulation of Vita takes care of PS1 CPU. The rest (SPU and GPU) is handled natively by Vita.
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