I have repeatedly tried blue 70 and ROKA

Unfortunate (because of price) the ROKA has always been fastest for me

I do like the blue 70. I also have their top end sleeved one..

They due run nice sales every so often.

150,000 yards is a lot of racing.

The big advantage of higher end wetsuits is better shoulder flexibility....which is much less of an issue with a sleeveless suit.

I'm an advocate for higher end sleeved suits (they are by far the fastest.....I was running mid-range suits then got a Helix and the speed increase was ~2sec/100m...ymmv). For sleeveless get a lower end suit with lots of 5mm rubber to float you.

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I agree that you get more with the more you pay in high end sleeved wetsuits. Not so much with sleeveless. I just replaced my 20 plus year old Ironman Triathlon sleeveless wetsuit with a Sailfish Rocket. A lot of great Black Friday specials out there.

I have had many sleeveless suits over the years and while I liked the (needed) shoulder flexibility none compared to the overall flexibility and comfort of Desoto’s two piece suits, specifically the speed vest top and speed tube bottom. I’ll never go back to a one piece suit sleeved or sleeveless.

Since most of the drag from a sleeveless wetsuit comes from the arm openings you would want a suit that fits well in that area.

Someone mentioned before that shoulder flexibility is a non-issue with sleeveless wetsuits and fit is less important since a short-body suit won't slow down your stroke like a short body full suit will.

The differences in rubber can make a difference but to me they have not been an issue.

I've mostly swam in my Xterra Vortex but have swam in Desoto, Aquaman, Huub and Orca. I like the Xterra the best mainly because of the durability of the suit and the fit around my arms, next is the Desoto 2 piece. The Aquaman was my first sleeveless, it was good as well but I bought it in 2003 so it's hard to compare because I was in a full for a few years before I went back to sleeveless.