Best disk crypto software?

I’m looking for recommendations and personal observations regarding hard drive crypto software, specifically the kind that creates an encrypted “vault” or virtual partition which can be unlocked with a password. I’ve seen a few like PGP Disk and Cryptainer PE, but any other recommendations would be appreciated. Bonus points if it’s freeware, but I’ll spend the money needed to get a good secure product. I know Cryptainer LE is free, but the vaults are limited to 20 meg each which is a pain to deal with.

Email crypto is not really an issue right now. I’m just concerned about my laptop being stolen/lost with client data on it.

I regard highly Scramdisk, which is free but has a backwards compatible “hardier” pay version.