Advice on whether to use AliExpress or Alibaba

I'd like advice from anyone who has used AliExpress or Alibaba. I understand that AliExpress is a part of Alibaba and as far as I know, AliExpress supposedly gives a tracking ability and puts payments in escrow until customer receives product, which Alibaba doesn't provide that service, but I would like to hear from drop shippers who have used both or either one and what positive or negative experiences they have had dealing with both or either one.

I can't speak as drop-shipper on either service, but I do purchase wholesale from a supplier on Alibaba and have never had anything but the highest level of service from them.

Aliexpress certainly has a much better reputation, but for me, it comes down to researching your supplier no matter where you get them from.