If you want flavor, I would suggest the crown. Best flavor of any tank I have used to date and the clouds are decent, not mind bending, but still pretty good.
If you want clouds, the TFV4 is a complete beast. I'll fog out my room in just a few drags and the flavor is pretty good but not like the crown.
I like my crown at about 65w and the TFV4 at 80-90w
I have no experience with unregulated boxes however so I'm not sure how both of these tanks will perform on said device since it can't be set to wattage