Coco is great. I have done coco and growth is good. I personally think the SIPs have won for me though. Extremely low maintenance w hydro type growth in organic living soil... So far I'm 4 weeks in flower and it just won't quit... Lol.
That's what I have for you instead of just coco...
Pros to good sized sips:
-long intervals between filling up rez.
-no nutrients to feed. (Dry ferts and amendments in soil)
-exceptional growth
-top soil drys out so gnats are gone
-supercharged w a simple airstone in rez