BOB’s are great, and are probably strongest strollers out there, they also push and steer remarkably well for how large they are. The main advantage of the Phil & Teds is that it adapts as your kids grow and is quite a bit smaller.
The designs of each of the Phil & Ted’s you’re looking at are so similar that if you don’t like one, you probably won’t like the rest. Most of the parts are basically the same.
Can you stop by a place that sells each and give them a test run? Take your child, push them around, fold it up, try and lift it, unfold it, imagine having it with you every day and putting it in your car/house/stairs/elevator etc. Then do the same with the BOB, there’s so much that can’t be communicated via pictures, advertising, and forums. So much comes down to your specific situation and how old your first will be when the new little one comes along.
If the first is a little older you might also want to check out some of the strollers that have a spot for the older child to stand while the little one sits or lays down. The Joovy comes to mind, some kids seem to love being a “big boy/girl” and having the freedom to jump out at any point, others get freaked out.