I don't know, but will hazard a guess that you will have a similar experience no matter which NLE (non-linear editor) you choose. They all seem to support similar formats and you will probably get the same speed out of them when working with AVC encoded files.

Any NLE will have to spend the time decoding the frames and, depending on the AVC profile, there is no guarantee it will be decoded correctly.

It would seem best is to just give it a try. Re-mux your MKV to M2TS, import to your preferred NLE and see how you get on with it.