Bickmore Bick 4 is an excellent product. I use Bick 4 far more often than Lexol. I use Lexol more often than Renovateur. Btw, Renovateur is a cleaner and conditioner, so its effects are a bit different than the others in my experience.
Lexol is very effective and useful in its own right, but it is not as light or as easy to work wth as Bick 4.
It's nice to have all three at your disposal.
To me B4 and Lexol are almost the same. My advise would be to buy the cheapest.