Yeah reload was probably the worst for me and I've tried each version - you get a bottle when you buy CQUK sealant. Never really got on with it and i know how to work with spray sealants like that. Beaded well enough.
Sonax BSD was good but was very grabby and difficult to get a good finish, i used this for a long time until Turbo detailer came about. Turbo detailer is basically BSD without the problems.
C2V3 was quite expensive and didn't really strike me as amazing.... I dont recall any issues with C2V3 like streaking or having a difficult time applying it.
I think Turbo detailer is so good in my book because its:
1. A proper detailing spray so good for removing anything you missed during washing (Like aphid s**t when you parked under a tree or water marks). A must for me to achieve a pristine finish after a wash.
2. A bloody durable sealant that beads better than most other products out there. I would say a bare ceramic sealant might beat it.
I've not waxed a car for over 3 years because of BSD and then Turbo Detailer.