This is not too easy to answer, let me try to give you an idea. Basically the internal flash of both is the critical component, which is expected to wear-out at some point. Both have a minimum write-cycle count of 10000. If we assume 2 write operations per operation on the device, you'd have like 5000 operations, means 7 operations every single day for 2 years - or 5 operations for nearly 3 years. This doesn't sound too much, but in reality 5 ops a day on average is quite a lot. On top of that, there are 2 things to consider: a) there are measures in place to reduce the wear-pressure on the flash b) we have a hardware-in-the-loop setup for our firmware builds the devices connected to this system have seen 20k firmware flash operations (where you cannot do anything against flash wear) and these don't show any signs of degradation. So to summarize: both should be equally durable from our current experience and in realistic usage scenarios they should reach 5 years, most of the time more.