Hyrdraulic disc brakes have excellent modulation
Some hydraulic brakes have good modulation, Hope for example are so modulation orientated some riders find them initially difficult to get on with, leading some to think the Tech2,3 werent powerful enough, but it is ,which Hope at least a case of to get the full stopping power you needed to honk on them harder than others.
Shimano on the other hand, XT, saints especially, are more a powerful initial bite.
Cant say anything about the braking characteristics of others - Sram, Magura, hayes as I've never used them. I am and have always been a Hope user so Im more attuned to how they feel. Dabbled in Shimano(XT/XTR/Saint), but prefer Hope as those are very serviceable
Sheer power wise its always been trickstuff, but at between £900-£1300 a bikes worth, they're more the top end DH/Enduro/EMTB offroad type
There has been a copy of Trickstuff recently released by the name of Lewis brakes. They're touted to be similar to Trickstuff Maxima but only about £500(similar price/power to Hope T4 V4's) But Lewis are new to the game and while theres plenty of positive reviews, I think its only fair once theres some long term reviews in there also.