Not OP but I, personally, stopped using Fusion because of the constant annoying advertisements. I could understand if it were free but I paid a non-trivial amount for it out-of-pocket.
I can't complain about Parallels' performance. I was satisfied with it in that regard.
I assume you mean Parallels in the first paragraph? I use Fusion and have never seen an ad in it.
Oops. Yes, thanks.
Parallels is even slower than VirtualBox and it's like Duplo to Lego, 'Parallels - my first VM'
Source on VirtualBox being faster? Couple of benchmarks I've seen put VirtualBox at considerably slower[1] and Fusion slightly to considerably faster than Parallels.