They have some benchmarks vs regular python here :
https://github.com/mypyc/mypyc-benchmark-results/blob/master...
One difference is that MyPyC compiles your code to a C extension, so your are still dependent on python. On the other hand you can call regular python libraries with the normal syntax while, in LPython, the "break-out" syntax to regular libraries isn't straightforward
In any case super exiting to see work going into AOT python