Get a Karma
I'd say the Burn over the Mamba, but strongly suggest the Karma over either. The new Burn has tried to copy some of the features of the Karma, but maintains some of the old Burn design. The Karma brings the whole package together best. Just accept that if you are smaller, for whichever size of a Karma you chose, you may have to glue some foam thigh hooks in to improve the fit. That is the only issue with Jacksons. Otherwise, the hulls are superior and the bulkheads are the best and safest.
No risk, no reward. It is not that we have to, it is that we get to. Preparation and education are essential to self-confidence and success. - KV
"If there is no risk there is no adventure."- Bill Briggs