Hey, Monica,
If you need to use it for the car. mostly, you'll probably need a sturdier frame that won't get wobbly after numerous folding. You picked well, your choices are of better quality and reasonably sturdy. Personally, I would probably go for the Joolz Aer+ as I found that one the best made = the sturdiest, and the ride is, from my point of view, superior to most strollers of this (travel) size. Also, the seat is very nicely sized - comparable to the Butterfly while having a pretty much lie-flat option in that Plus version.
The Metro+ is very sturdy, although a bit larger than the Aer. I like the padding there, the stroller is better for smaller babies because of it, but if your baby is a toddler / bigger already, than the Aer is a bit better, longer lasting choice.
The Butterfly is a very nice stroller, but I think that for the price, the Aer+ is better and sturdier at the moment. I will also mention the Uppbaby Minu V2 which is also sturdy, a bit larger after folding, and comparable in seat size to the Metro+ (Aer is a bit roomier).
My best bet would be the Aer though, if your budget allows it.