I can't comment on SMD Refuge, but I do have experience with the Squall (both original and Squall 2). The Squall is a nice compromise between lightweight and space. I own an original Squall and my main hiking bud has a Squall 2, which I have checked out and been in before. There isn't a huge difference between the two other than the Squall 2 has some tweaks and other minor improvements. So all my comments will be based on the original Squall as that is the tent I have personally used.
I wrote up some thoughts I have on the Tarptent Double Rainbow (which you may also want to consider) in a recent post ("Lunar Duo vs. Double Rainbow), and a lot of the general comments about ventilation, condensation, etc. are also applicable to the Squall. So check out that post for some more detail.
My main complaint with the Squall is the head room, and with two people in it that is even more of an issue (depending on how tall your son is…he appears to be fairly young from your avatar…so maybe this isn’t an issue). Its peak height is at the main pole, which is directly in the middle of the opening where one enters and exits the tent. From the peak the sides drop off fairly steeply leaving only a small "sweet spot" right near the pole where one can sit up straight without hitting the ceiling. The Squall 2 has a slightly larger "sweet spot" due to the horizontal pole piece at the peak.
Other than the head room issue when sitting up I think it is a great tent as long as you are aware of and accept all the idiosyncrasies of using a single walled lightweight shelter.