Ok, so I've been looking for a good variable ND filter to replace my Fotar pos. I've checked out Hoya and Tiffen for the 67mm and I've noticed prices are very similar on them.

So, with that being said would you recommend the Hoya or the Tiffen? I know they're both good quality but from my understanding Tiffen may be slightly better? It's going on a 18-135mm lens but I'd still like a good quality filter.