I've tried the Cleto, not the Smok tank, as I'm not much of a sub0hmer. I got pretty decent flavor out of the cleto honestly, just big clouds weren't for me. What wattage do you think you want to run it at, and is your pico stick the 75 watt deal? If so you may be able to run your BB or BBB tank on it, depending on the types of wattages that you are trying to pull from it and how often you vape. If you are at higher wattages than on the cleto, you may get less runtime from your pico. If you find that to be the case (and flavor is going to depend on your coil selection too, I think) you may want to get another mod and use the pico as a backup/spare in case anything ever goes wrong with your equipment.
IF you wind up having trouble priming coils, some folks have gotten good results using a needle to poke a couple holes in the cotton in the coils, to loosen it up and help with wicking. Some of the smok coils can be a little tight with the wicking, though some folks notice no issues at all with it.
Anna
Best of luck with whatever you decide.