It all comes down to how "futureproof" you want your setup to be. The 60w mvp is great, but the major downfall is the battery. If you forget to charge it one day, you may well be stuck with a mod that you just cant use the next day unless you are tethered to a wall. Also, when the battery finally stops holding a charge, the device is done. It is a throw-away device in that aspect. I ran through that with my MVP 2.0 when I had it. It won't hold a charge, so it is basically a blocky paperweight. If it had a replaceable battery, it could still be usable.
Sig 150
Pros:
Replaceable battery when the battery is drained(just pop new ones in and go)
150w of power available(2.5 times what the MVP 3.0 Pro offers)
When batteries won't hold a charge anymore, new ones can be swapped in rather than having to throw the device away.
Finer wattage resolution(adjustable in 0.1w increments up to 50w, then 1w increments from 51-150w vs 0.5w increments
Does everything the mvp does aside from charging other devices
Should come with a sleeve
Neutral:
External charger and batteries you have to buy will be additional costs, but they can be used for future devices.
Cons:
Higher up front cost for batteries and charger
No usb/iphone charge ports(never used the usb port on the MVP 2.0 I had)
MVP 3.0 Pro
Pros:
All in one package
Slightly smaller size
phone/iphone charger thing
Lower up-front cost
Starter kit includes a tank
Neutral:
Internal charging circuit saves you from having to buy an external charger, but will render the device useless if it stops working.
Cons:
When the battery is drained, you must either tether yourself to a wall, or not vape at all.
When the battery no longer holds a charge, the device is pretty much junk
60w limit may restrict you in the future on custom builds.
0.5w increments as opposed to 0.1w increments(this only applies up to 50w. The sig does 1w increments after 50w)
Conclusion: If it were me, I would go with the sig 150w. I was in a similar spot as you and just didnt see any reason to buy a device that was going to leave me wanting more down the road and lead to buying another mod. The Sigelei does everything I would have asked the MVP to do and then some. I don't like the idea that the mod is pretty much junk when the battery wont hold a charge anymore. If my batteries won't hold a charge anymore, I just get a new set of batteries and it is good to go. On the same token, I like being able to just toss in new batteries when the ones in it are drained. When I am fishing and chain vaping for 8 hours or more, I can happily go through a set of batteries. With the MVP, i would either need to vape less, carry another device, or deal with not being able to vape when the battery dies. With the Sig, I just carry a spare set of batteries and toss them in when the first set is drained. I like that the mvp is smaller, though. For a here-and-now device, the MVP is great. There is no denying that. If you don't plan on going above 60w and don't mind throwing it away and buying another when the battery takes a dump, it is a great choice. If you think you are going to want to go over 60w in the future or that you don't have to throw away when the batteries wont hold a charge, I would just say to get the Sigelei. Assuming the electronics in neither device fail, it should last longer, since you won't have to worry about the battery no longer holding a charge. Since it can go all the way to 150w, you won't be stressing the internals as much if you plan on running at 50-60w often.
