Haha, that's fair.
I'd only ever heard of Pandora's Reflection once in a PSP RPG Tier List video I mostly just listened to a few months ago, I forgot it was a thing.
The guy liked it enough to put it in A tier, and another review I skimmed through also seemed to be favorable, but I still want to reiterate that Breath of Fire III is probably regarded as a classic for a reason. I wouldn't know, I haven't played it -- something that sadly applies to a lot of JRPGs, classics or otherwise -- but still.
Anyway, there's no chance these games will be on sale ever again, so there's no real reason to fret. Go with which one interests you the most, an old, traditional turn-based RPG or a real-time strategy game thingie, and buy the other whenever.
The base price of Pandora's Reflection in Europe is twenty bucks, which is pretty dumb. Still better than Fate/Extra and the PSP Persona games' (sans the first one) thirty.
Huh, Trails in the Sky seems to have been delisted from the store on my end, but not SC.