You might prefer the 3D Remake of FFIII over the original/pixel remaster. It's not an enormous improvement, but it's a little bit easier and slightly less esoteric than the original. There is seemingly an attempt to expand the game's narrative and flesh out the player characters, but it's rather quickly discarded. And the final dungeon in the game is a bit of a slog. Overall, FFIII is fine for what it is, but it is considered one of the weaker entries in the series, so no shame in making use of the Pixel Remaster's QoL features to get your way through it.Funny, my last game that I finished was FF1 Pixel Remaster.
Before that I played FFV but so far I couldn't get myself to finish the final boss (the final stretch of this game is tough as nails for some reasons). III I couldn't bring myself to play yet because I basically heard how it's a watered-down job system version of V with less story. That's why after I, my plan is now to go for IV and then for VI.
FFV is also considered a weaker entry in the series, but it does have its defenders. I haven't played it yet, though.