Depends. On a New Character, Riding Lessons are the most useful, hands down. Period. Followed by Bag Space Upgrades.
For a Crafter, the Mimic Stones are the most useful as the Style Mats have been rendered quite rare for the new motifs. Finding the chapters is pretty easy, finding the style mats is not.
I would love at least a portable decon station, no need for crafting. I do see how the Banker or Merchant can be nice for Grinding Sessions, but, really, if your bags are full, you should be taking a little break.
rotaugen454 wrote: »Actually, it IS a portable Decon station that I really want. I can fill my bag very quickly when grinding. I am literally running from fight to fight, picking up a lot of loot. I Devon any blue and above that I don't want, and they eat up the space quickly, especially with the CP perk for a better chance at higher quality items.