I think you can give us the answer after a few sessions.. I suppose you’re a light weight..
I owned a 150 and after that a 140, the 150 had a slightly better low but the 140 felt much better (in jumping and rotations)
My opinion on the low end; I think the 150 will have a better low on TT stance then on mutant stance.. I think you hit the brake too much in mutant stance..
But please try it and let us know!
The 150 Mako (wide) is my light wind board. Mine is not a mutant capable model. I get on the 130 as soon as the wind picks up. It sure is easier to change boards rather than kites !!! p.s.: I learned to kite on a 150x34 Mako prototype & have been a Makoite from the start. I find the wide 150 works much better in light winds than the narrow one. My weight 185+ ... Kiters on race, surf & skim boards seem to be able to do a little better in light winds however !!!
I have a 2011 Mako 140 and just purchased a 2012 King in May. I love the King in light winds on Lake Michigan (10 to 15 knots). I weigh 165 lbs. I ride it twin tip if I’m staying in the same location and mutant for downwinders. It allows me to work on lots of different transitions in chop/small waves. We rarely get flat water on Lake Michigan. I think the 150 would work well since you are probably much smaller than me. The larger Mako lets me slow everything down and pick a nice roller/ breaking wave to play on. Riding twin tip also lets me work on weakside toeside turns without losing speed when coming around. The big mako’s are way more fun than light wind barndoors. The King replaced my lightwind glide. I ride it with a 12 meter Slingshot Rally and spend afternoons playing in 12 knot winds.