Yes I try to max all the stats. It's an achievement knowing my characters are top notch around the world. The only one I haven't is Final Fantasy II.

Most notable starts off with FFIV. After level 65 or something each character can level up in 3 or more different ways. Stats go up or go down. However there is a certain chance you get good stats. It's best to save and level up one at a time resetting when you didn't get the desired stats.

With Final Fantasy VI you have to do a low level challenge until you get certain espers. It helps to spend time on the veldt to learn all the spells so you can vanish/doom enemies. It takes a long time and personally it is my most consuming Final Fantasy to max stat cause of all the characters.

Final Fantasy VII is also time consuming due to you have to morph thousands of enemies in the underwater sunken ship. I tend to level up my materia during this as by the time I've mastered 8 KOTR my characters are usually all maxed.

Final Fantasy VIII is easy if you got speedy fingers and a lot of time. You can buy tents, turn them into mega potions and sell the potions for $. After that it's about buying items and turning them into stat ups. The only thing I've never did was Luck and Evade maybe I lacked speed too but idk.

Final Fantasy IX has a couple items where you can earn extra stats at level up. This has to be done in a low level challenge as the stat increase is so small you want to do it a lot on each character.

Final Fantasy X is easier to do cause by the time you max out the sphere grid unlocking all nodes your stats are almost maxed out already. You don't really need to grind a lot of spheres unless you want to max HP/MP.

Final Fantasy XIII-2 is the most beneficial as it makes a lot of boss battles seem like jokes. Big nodes on the characters crystarium determines stat boosts. Commander and sabator level up strength. Ravager and Synergist as well as sabator levels up magic. And Medic, Sentinel, and Synergist levels up HP. Some jobs level up two things depending on odd level or even levels. Like Sabator would level up strength on a even level while if sabator is on a odd level it levels up magic.

I do aim to have the best characters. ;P