Pros and cons to both, but IMO sumps reign supreme. You just can't beat the amount of media and added water volume. Plus, you've got a ton of options when it comes to media, whether bioballs, ceramics, scrubbies, K1, etc.
For me honestly, I would go all canisters rather than wet drys. Cost is about the same and don't let anyone else tell you differently. A used fx5 or ehiem on craigs will surly cost less than a sump for a large tank. The tank, pump, overflowbox, dividers, aren't cheap... But one could argue a diy route for the overflow but still its over 100 easily for a large tank...
I'm finding myself maintaining my sump on my 220 more than my actual tank. Water evaporates which leads the pump to run dry which leads me to refill every 4-5 days which is a PITA.
Canister and hob combo. I have 5 tanks in this size range, some community, some single fish. Filstar xpxl and AC110 is a good setup. 135g in my bedroom I run 2 Filstars, just because they are so quiet. The timer on the light makes more noise.