I think if this becomes a "sticky" then it's worth mentioning that I found the dual motor controllers are a lot simpler over the "esc per motor" setup when starting out. I say this from the point of view of someone that had no one to physically ask when first starting out. I think if you get into it through friends etc. it's different. Things such as cutting one of the BEC's, not realising my cheap transmitter wouldn't do mixing, then when I bought another it wouldn't get full throttle etc. When both motors and the mixing are done by the ESC it just becomes a case of faffing for 10 mins to get it calibrated and running right with the handset trims and swapping + and - about a bit. The other big thing was that I built my first feather without soldering as most of the dual controllers have terminal blocks built in.