I would go for value in general. However if there is/ are specific clan(s) that you lack a lot of cards I would consider choosing them based on the value of the cards missing. However, given that higher value should translate into being able to trade for more valuable cards, I would prefer the value-driven choice, generally speaking.
Here is a link to iclintz to help you in your decision (when considering the value of each clan): https://iclintz.com/packs/clans.php
Personally I usually go with the 4 newest clans because they have a smaller pool of cards to pull from and are usually more valuable than older clans because there is less on the market compared to older clans and overall has more usable cards among their whole clan and usability = value in most cases. However, because of Lady Ametia skeelz is currently the most valuable clan to pull from excluding cr/mt if you want to roll that dice
Here is some info from iclintz to help out