For looks I like the IPV3 better & it also feels a little better in the hand. Other than that, they're really both even. I guess a plus with the IPV3 would be the upgradable chip, but I really don't take it much higher than 50 watts so that really doesn't matter to me. Like I said, you really can't go wrong with either one.I am jealous of you
Which one you prefer if you gotta pick one? I was debating really hard between these 2 and just love the magnet door on sigelei. I know I will never use USB charger so sigelei fits the bill. Plus 100w is more than enough for me. I usually stay around 20w the most but may be time to start experiencing with different coil built.