Anyone willing to guide me on which combo to go with?

1) Castle Creations Mamba Monster X ESC w/ Tekin Gen2 T8 4038 1700kv motor

2)Tekin RX8 Gen3 ESC w/ Tekin Gen2 T8 4038 1700kv motor

The reason I would go with the CC MMX is because its "waterproof" and I'm getting the impression from my research that Castle's ESCs are more durable than Tekin's. Has this been found to be the case for you guys? Does anyone have any experience with Tekin's new RX8 Gen3 ESC that could chime in? Thanks a lot for any input.