That can't be answered in general. I take it you're talking about the speed booster? In the end you have three future possibilities:
- Stay with Micro43 > Speedbooster for M43
- Go with Sony APS-C > Speedbooster for E-Mount
- Go with Sony Fullframe > Smart Adapter for E-Mount
Seeing how you seem to be undecided about what to opt for in future, did you consider buying used to minimize losses when selling on?