All of my gear is 10f rame - I believe giving the girls a bit more space in the brood chamber (I run brood chambers at 2x deeps) gives the queen more laying space - therefore less prone for swarming - But with the increased number of bees you need to work the hive a bit more, stacking supers on top etc
Regarding the weight I’ve been using WSP frames for the honey supers instead of deeps, they shave the same amount of weight off as if going 8 frame deeps, but I get the increased brood space and as such, a bigger honey harvest!
If going 10 frame gear with the flow hive, I would recommend having 3 boxes instead of 2 (flow frames up top) just so you will have space in the hive for the bees
Note: don’t add all the boxes at once, let them fill the second box first before adding the flow box
The Bunyip Beekeeper