I would think both would play better now with the advancements. Metal Gear seems like it could work in a way because it always played slow and stealthy anyway.
Metal Gear would prove problematic IMHO as you really need an L2 & R2 which RS-97 does not have... Even the PSP version is awkward to play due to these butttons being missing.
Just my opinion though really
Dingoo x2, GCW0, RS-97 x2, Revo-K101, RS-90, PSP, PSP Go, GameGadget, New 3DS 128GB, PS Vita 200GB RS-45, Gamebox Advance and a few other obscure devices