We are looking for a 2 in 1 stroller for a new born. We would like your opinion on these strollers and which one is better for long term period:
From the long-term point of view, you always need to look at the size and practicality of the seat unit. Not only that it is reversible (actually, not reversible pushchairs last much longer, which is why you most probably will have a buggy eventually, when your child is later in its toddlerhood), but also a tall enough seatback, a long enough leg rest and a canopy that is not immediately over the backrest.
From your choices, and I also look at the roominess as well as the overall quality of your options, I would either go with the Joie Finiti, as even if a bit open, it has a nice enough seat and overall is a nice value for money, or the Bugaboo Cam 3+, even though that one is mostly suitable for smoother roads, and I believe the Fox is much better made in terms of wheels and pushing.
The Strider M seems not worth the money in terms of quality and usability, and the Prime is a cheaper pram that is not bad per se, but is simply worse, materials-wise, and bulkier, compared to the other ones.