I've put in a fair amount composite, mostly Evergrain, and also quite a bit of wood (p.t. 5/4 radius edge and 2 x 6).
The treated lumber is considerably cheaper than the composites, and feels better under foot to me. Also, it doesn't sag between joists, which all the composites that I've seen do, even with 16" joist spacing. The biggest problem around here with lumber, even p.t., is rot at the butt joints. Good spacing helps, and so does solid stain, but if snow stands on it every winter it's hard to keep it from developing rot. I see it lasting 10 - 20 years around here if done right and taken care of.
The composites don't typically rot (although I have seen some early composites degrade, I don't think it 's much of a problem now). They will support mold growth, as does most of the vinyl siding in our area. Much worse than wood in that regard. Solid deck stain can be used to spruce up old composite - I do this for a small condo association. A quick coat to the floor and railing tops every couple of years doesn't take long or cost much, and they look nice all the time.
Grandson and I recently tore an old (~15 years) composite deck floor off that had degraded and actually started to fall apart, but this was a covered deck and only the parts close to the edge that got a substantial amount of sun degraded. Found out from my local supplier that there was one production year from this manufacturer that had a manufacturing flaw (evidently inadequate UV protection). Replaced it with Envision, which looks like it will be good. If you use the screws designed for composite decking you get a clean look without using hidden fasteners.
Personally, if I were doing it for myself I wouldn't install it on less than 12" centers. If you'll get down to eye level on composite decking installed on 16" centers, every deck that I've seen had a little sag between joists.
Everyone wants maintenance free, but I haven't seen anything yet that is.
If the location favors it, I'd take concrete over a deck every time. Keep in mind, all my experience is with decks in Missouri and Illinois, where we get plenty of humidity, rain, and some snow. If you live in a different (dry) climate you may have a different experience.