I prefer the developer version. I know the experimental version has custom flight planner. I can see the benefit of the custom flight planner if you do a lot of serious flight planning with SimBrief. But when I tried it with default flight planner. It caused more problems than it solves.
So I don’t see the benefit compared to the default flight planner since I never had any serious problems with it. Been flying with it for months and I always fly and arrive to my destination without issues everytime.
And the experimental version doesn’t have a working weather and terrain radar yet. So I don’t like using it. Since those radar are important to me when flying to difficult approaches like Paro.