While I will not compare the two (mycloud and buffalo) side by side
I dislike buffalo (all about the software) :
- unhelpful error codes
- no logging (it's important if we're allowing the nas to connect to the Internet, ie., 放出街)
- does not support SSH
- next to useless mobile apps
btw, buffalo's H/W level is not bad. My 3-yrs old LS410D (same as LS420) was using Armada 370 (1.2GHz) with 512MB ram ... considering it was only an entry-level nas.