I have the Vitapro Fusion and it is nothing to write home about IMO. I look for a leave in to detangle and provide slip and or softness. This does neither for me. Once i finish my bottle I will not be turning back.
Vitapro fusion is essentially a liquid version of the direct leave-in, but it doesn't work the same. If you're looking for a regular leave-in to put on damp hair after washing, then definitely go for the direct leave-in. If you want something to put on dry hair (for daily maintenence, moisturizing, etc) you might want to try the vitapro fusion.
The Direct detangles better on wet hair, and the Vitapro detangles dry hair well. They both are very moisturizing on my hair. I use and love them both