Any thoughts on the strengths/weaknesses of one vs the other by people who've used both?

Cheers

I have 1400 and 1800 AH and the standard 1150. Cannot compare directly because of the size difference.
The AHs feel very smooth and allow me to pump and foil with small sails, I use them with 5.8 to 7.0 sails; can get going in about 10 knts with a little gust and a bit of pumping.
For wind foiling I like the 1400 better unless the wind is very marginal, it accelerates better in the gusts and is easier if overpowered.
I don't do swells so cannot comment on maneuverability.
The 1150 is great with more wind and a small sail around 5.0, much faster, a lot of fun.

Windfoil only.
1150 is my lightwind setup, down to 11 knots with a 6 meter sail. At 22 knot wind, I'm down to 3.7 sails.
Kite600 needs about 2 knots more wind. Feels free'er and more glide, faster and smoother.
72 kg.