It depends on your mechanical skills and budget.
If you are a tinkerer with a low budget then go 80 cc China girl frame mount. They can be reliable, but it takes a learning curve and time to get there. I still think these are the most configurable and tunable.
You can also check out the 4 stroke frame mount. Some of those are looking nice, but are more expensive.
I'm not a rack mount kind of guy.
:welcome:
