I use just because I have been using it for 14 years and I am too lazy to learn blender 
has a big support community and loads of tutorials online which makes it easier for people to learn.
I have modeled big scenes in (3-5 million polys) and exported them to UE and they work fine.
granted, is expensive, but it is on subscription now for £145 a month for monthly basis, or £97 per month for a one year contract, so maybe a bit more affordable …