Don't speak of best in the genre until you have played the above tbh... as that game is a damn near masterpiece, let down only slightly by some balance issues. (that fan made mods claim to address)
TS was one of my most anticipated releases of 2022, but learning that it is so heavily stacked with story over gameplay, is disappointing to say the least, as story is not at all what I come to this medium for, its to engage my mind with interesting problems to solve and if I have to wait one hour (I hope people are exaggerating here) between being able to continuously partake in that, its going to be a real slog. I probably will eventually end up playing this, largely because we are so starved for actual good games in what is one of my favourite genres. But I will probably sooner go back to my FFT A2 playthrough that I started a while back before playing through this, simply because its giving me more gameplay for time invested.
This is my childhood favorite on the SNES
The one you've posted is the remake, its actually better than the SNES version in some way, but way worst than the SNES version in the other way.
The remake did improve gameplay in terms of customization like FFT, but they also completely mess up the game with its level system and progression system at the same time, unique character does not felt unique anymore, some boss and special character lose its impact due to this, and that level system makes a lot of frustration too (every unique character comes with level 1?). My feeling towards this version is complicated, its good and bad at the same time. And maybe its just me, the remake also lost the atmosphere of the original, especially the dreadfulness.
Triangle Strategy in a lot of way are very close to Tactics Ogre than FFT in terms of story. They both have multiple path and ending with dilemma of choice, they are both very grounded compare to FFT, in some way Tactics Ogre (especially the SNES original) felt way darker than TS.
But gameplay wise they are very different, beside map and elevations, TS plays more like Fire Emblem with its progression system, with linear character progression path, and no weapon options.
Finally if you ask me which do I think is better TS vs TO, I would slightest vote for TO (no nostalgia, if nostalgia was included this comparison is going to be much more biased than this), but TS is as close as it gets in terms of quality, especially consider most modern SJRPG does not reach the same height anymore, TS is in a very good direction, I really hope they did well with this game.