1.4 added some new captchas but honestly most of them are completely unnecessary, and I doubt many even use them. I'm surprised the are you a human captcha wasn't added in this update. Anyway, I'd suggest that to be added. User friendly, simple, works on most devices and no need to figure out words in a picture of goop.
While i believe it has its issues, this is the one captcha I would use if we ever have to go back to them. Solved 99.9% of our spam problems on vBulletin.
As it stands Xenforo 1.4's honeypot doesn't keep out spammers like 1.3 with Tenants FBHP did. Only get 1 spammer a day from 1 or 2 sources that I can identify but if it gets worse I might add a puzzle captcha.