If you have the space it will get used.
We started with a V40 while we had only a 55lbs lab/border collie mix and before we had kids. It did great even with one (no dog by then) and even two. We also used a roof box sometimes for big trips. For our follow on to replace our Honda Integra 4dr in 2010 considered V70, XC90, and Q7. We picked XC90 as it was the roomiest of those choices and it has been a great choice for our family (we truly have traveled everywhere it can go on-road, off-road, snow, desert, forests, arctic, and sometimes even while towing - Volvo makes awesome safe and comfortable family adventure vehicles 😁). We used a Bugaboo Chameleon as our pram/stroller (it's big) for all of our kids and even traveled with it when we had our V40 (Volvo Weekender roofbox was great for it on big trips), and even took it with us for our 2010 XC90 OSD 8 weeklong summer trip across Europe with 2 rear facing seats.
Return home from Christmas trip to visit family 1600 miles away with 7 month old, Christmas gifts, Bugaboo, and some extra contraband.
Our V40 stopped working well for us for family trips when we became a family of 5. In 2017 we ordered another XC90 to replace our V40. By this time we had 3 kids and same trip to Europe for OSD taking our Bugaboo again. PLUS a mountain bike in a bike travel box for our oldest to do summer camps in Belgium.
If you have the space you will use it. For 2017 during our OSD 7 week summer vacation across Europe. The hard case on the bottom had the mountain bike, soft case propped up was the Bugaboo Chameleon, behind that there were 3 suitcases and other bags for the 5 of us (11yr old, 7yr old and 23 month old for that trip) traveling with one rear facing seat.
Last year during our 8 week long summer vacation across the US. We were 6 (5 + our puppy), carrying 6 bikes, a paddle board, food, clothes, camping gear, extra fuel, etc. If you don't have the space, you will find a way. 😉 You'll be fine with either, it all depends on how long you plan on keeping it and how you plan on using it over that time. Our youngest is still in a rear facing although is likely to outgrow it any day now 🙃 - our baby. We keep our cars 10+ years (V40 we kept 18yrs) and overlapped with having both XC90. It was nice having a small car to run about in sometimes.
Sometimes we need both at the same time 😆.