ultimately i am looking for the most easy to maintain and the best for the aquariums ecosystem.
Well then you are going to want a bare bottom (BB) or a shallow sand bed (SSB). I use a coarse sand in my SSB and it only requires a quick vacuuming with every water change. I think that if you used a crushed coral SSB you might have problems with detritus building up over time, but I'm not sure (I've never had one).