In which case you buy a Zenoah or 3w. The 3w has more power than the DLE 30 but you're going to pay a lot extra for only a little difference. One cost a lot more than the other and the lowest priced of the pair costs more than a DLE. The other option is Syssa and it does not have a long use history yet either. The longest history of the better Chinese 30cc class engines is the DLE.

One has to decide on the relative importance of various factors.
1) Cost
2) Weight
3) Power
4) Reliability
5) Ease of use
6) Customer support
7) Life cycle

The order of those factors determines what is purchased, and what it costs. There are no free rides.