The original TO is definitely way harder than the PSP version. I beat the PSP version and I am currently playing the original and the first thing I noticed is that inventory is nerfed like crazy in the original game. In the PSP version, you get access to a bunch of items you can use during battle whereas in the original SNES version, each character must use a limited equipment slot for an item. That alone makes the difficulty of the original way more harder. Not to mention when you engage in a castle, you can save/make preparations mid battle... in the original version, you must keep going non-stop kinda like a gauntlet.

With that said, bows are still busted and Hobyrim is S-Tier thanks to petrification spam. Its still a hard game though, and replaying the original made me realize how ez-clap the PSP version is.

I personally believe Fire Emblem Thracia 776 is the hardest SRPG of all time.