treve/wobb is a lot easier to setup then 2 stage 2 lines, the issue with EX's or anything that drops the lock makes it very easy for people to out play you. For instance, wobb locks abilities and trev locks items, if you openly attack with an EX or something else that is not locking your opponent it gives them more possibilities for cards they can play. Wobb also does the same thing that aegislash does except the turn after you attack it gives your opponent options to setup with some very powerful game winning hands, so against, lets say greninja, megamanectric or ho-oh they can heal with ho-oh, they can drop a shaymin, they can play item cards, where as with wobb they can't heal and drop a shaymin and with trev they can't drop items to accelerate their draw power.
So pro with ageislash, you might take X amount of prizes and win the game with a single attack.
cons, slows down trev's setup rate, loses priority to trev, is not overly consistent, constitutes the use of slots better used for burst ballons, breaks the lock.