I was 130 kg when I started SUP and same height as you.
I found the 11'2 Avanti to be a very easy board.... just get on and go.... zero stability issues at that width, and found it to be an awesome flat-waterboard.
I wish I still had it for all my winter ice escapades', where stability is nice to have.
It also surfed great in all conditions.
I have never tried the Atlas, but I did recently pick up an old Starboard 12'6 x 30 Cruise.
The cruise is much more stable at 30" than any other 30" board I have paddled.... so my guess is, Starboard has figured this out
The Atlas will probably be a slightly faster paddler than the Avanti... but I always loved the glide I got from my Avanti.
Probably can't go wrong with either one of them.... but the Avanti will be the most stable and it was a much easier board to surf than my narrower Cruise.
I love playing in small waves on the Cruise, but mainly because turning it requires soooo much finesse, that the challenge IS the draw.
The curvy hips and tail rocker on the Avanti make it super easy to turn... even in small waves.... it has an amazingly smooth flow to it in waves for such a wide board.
I have generally found that Starboards are more stable than Naish products, (I have owned 4 Naish Nalus and Mana's)
I looked up the Atlantis Halo 11' ..... it is a great price and a nice looking board..... BUT, I think that the combo of less liters and width may be more of a challenge than the Starboards.
See if you can find a used Avanti or Atlas..... they have been around for a long time.... that may help on the cost.
Have fun looking....