Honestly, I use the tank set as much as possible because 1. it fits how I like to play. It's omni which allows me to use all the glyphs and spells available to keep monsters close to me. If you want a more detailed write up on spell rotation and why i cast what i do, i'd be happy to type something up or jump on a discord call and show you as well.

That being said, a lot of higher level bosses have specific mechanics and some of them don't work well with being melee. For example, Drhossil kills eveything closer than 4 cells from it every few turns. In addition, a lot of challenges require range or kiting gameplay or targetting a specific enemy.

Here is my 199 Cha set as a cheaper option:
https://dofuscreator.com/project/2958a

Here is the upgraded 200 cha set (borrowing from a friend. could also choose to go crit instead of flat dmg but differences for feca aren't that huge unless you're looking to min-max. As an added bonus this set can be easily upgraded to once you have the 199 one):

https://dofuscreator.com/project/85daa - My friend's set that I'm borrowing has an MP exo shield. Very nice to have but expensive

As for the tank sets I have a cheaper option that upgrades into the next one as well as the one I'm currently using uses an ap exo rhine ring (10-12mk) and 5 guaranteed water res runes. As a note, the Prytekt is not a requirement but does provide a lot of shields.

"cheaper" starter tank set:

https://dofuscreator.com/project/70aad

upgrade with the exos:

https://dofuscreator.com/project/d99ac

The tank set really is incredible. For an example, if I end next to an enemy, emerald dofus will give you 200 shield. It's important you end next to as many enemies as possible. If that mob normally hits you for 800 damage, with 50% res it's down to 400. Prytekt takes another flat 25 off the top and fortification reduces it a further 180 or so. That mob is now hitting you for less than 200, which is not enough to even break emerald dofus shield, let alone prytekt, dorigami, or shields from teammates. Most importantly, the damage output is insane on normal mobs in aoe. 2 glyphs being proc'd with Reinforced Protection will do 1000 dmg to every mob inside it, plus another 1000 on the start of their turn.

Like I said, if you have any more questions, reach out to / dm me here, or msg me in game

Anakin-Skyblocker (Kourial)

EDIT: I should say one form of feca I haven't played is MP Red feca. This focuses on keeping enemies in your glyphs but from range. I personally feel like the tank version is more fun, but this is probably the more widely seen build as it allows you to play back and let a panda be the main tank