I'm coming late to the pod trend. I've got an orion Replay, Aspire AIO, and a Minifit. I decided to use pods only for backup and stealth which means not many puffs per week. The Orion is the best vaping, puff for puff, but weight and size make it not the best for backup and stealth. It is mostly an impressive conversation peice. The Aspire is competent, okay, but that's about it. The Minifit wins hands down for backup and stealth because because it's the smallest by far. It is also the least expensive of the three and the replacement pods are the least expensive. To make it work I made a batch of 36mg freebase, three times the strength of my usual DIY. I don't feel the need for salt nic.
Nothing wrong with FB nic as long a you get the desired strength. Nic% is nic% regardless of FB or Salts. The only small advantage of salts is if FB at higher strength delivers to harsh a vape or too high throat hit, then salts make sense since it adds the ability to tailor the throat hit to your liking.
I know that technically salts enter the blood stream just a little quicker, but in my testing it is such a small difference as to be unnoticeable.