Like everything in scuba, its a personal comfort choice. What you need to do though, is understand its failure modes and be able to handle them under water. I use a purge snorkel, but I could easily use a non-purger. Same goes with a mask. Tech folks poo-poo them, but then they poo-poo anything that isn't their particular diving religion.
Eitherway, it doesn't hurt to have a backup mask with you if you're on vacation - maybe a purger is your main, and the BU is a nonpurger incase you have a failure. Or not.
Eitherway, it doesn't hurt to have a backup mask with you if you're on vacation - maybe a purger is your main, and the BU is a nonpurger incase you have a failure. Or not.