)
For me I dislike SFM the most because it is trash at rendering given it is trying to mimic the style of a game from the early 20070s which makes things rather uncanny with harder lighting than you'd expect and etc. Given it's not using a physically based material model either everything looks fake so that's an issue too. The models would probably look more acceptable in Blender but yeah custom made stuff tends to be better if people tend to know what they are doing.