The big things I'd look at are the measurements in particular the width (wheel base) and weight as a double pram.

The Strider is 17kg as a double while the Select is 15kg. I personally found the Select by far easier to push - with one hand if necessary.

The Strider is 70cm wide at the wheels while the Select is 65cm. Five cm makes a big difference in shopping aisles

The quick fold on Baby Jogger prams in unbelievable! I have the Elite and can't fault it, it's an amazing pram. I just want to be able to use a capsule and toddler seat on my pram when #2 arrives so that's why I'm going to get the Select. I can't have my toddler and capsule in the Elite together or I'd keep it for sure.

I also love with the Select that neither child misses out on the view, lol I was so close to getting a P&T but really don't like that the child underneath just stares straight into the back of the main seat OR can't see a thing from the main seat as the toddler is right in front of them yet again, lol! I may be wrong but isn't that the same with the Strider seats?

The Select is an all-terrain pram (not as good as a classic 3 wheeler but the wheels are designed for bumpy roads) so I can't imagine the ride would be bumpy.

With regards to reviews, the Select is still relatively new to the market and a lot of changes were made to improve the pram in the new 2011 model so there won't be as many reviews as there would be for something like the Strider.

Hope some of that helps, they are just a few things that I looked into with prams and comparing against the Select.