vhls

I know that VHLS is a subset of ZBLS. There are too many ZBs, so I'm thinking of using VHLS as an alternative. Is it overwhelmingly better to use ZBLS than to use VHLS? If I don't use ZB, is it better not to use VHLS because it's trash? (assume that I know full ZBLL) 1. ZBLS+ZBLL 2...

I'd like to know how often an all-edges OLL case can be forced using VHLS, ZBLS, etc.?

I'm trying to lear ZBLL but the recog is just terrible... and I'm not sure if the alg database is really a good place for learning ZBLL algs. Sugestions?

I recently learned of vhf2l, and wonder if it is worth learning, and if it will improve my time. Please post your comments on either kinds of f2l. Also answer to the poll.