I agree with WildWop in regard to the load times, because it single handedly ruined all of the PSX remakes.
Final Fantasy 6 is the better game, with an excellent plot line, a plethora of interesting characters, and a good combat system (though the translation is lacking in the second half of the game, the World of Ruin). I did enjoy Chrono Trigger, and the time travel theme was relatively intriguing (though the storyline goes to hell once you get into the alternate dimension bullshit of Chrono Cross). The tech system--especially the ability to combine special attacks and magic with other characters--was an excellent and refreshing idea, but the game is simply far too damn easy and a much shorter romp. Final Fantasy 4 was, well, decent. Worth a playthrough, but not really noteworthy outside of it being the first SNES Final Fantasy.