[alephnil]

It depends what you want. If you think of the ordinary CPython interpreter, that is unlikely to ever reach the speed of Julia, and I don't think that is even a priority for the Python developers. So if execution speed is very important for you, go for Julia.

On the other hand, it is not likely that Julia will even come close to have a similar ecosystem of libraries as you can find in Python in the foreseeable future. The exception is Numerics-heavy fields, which is Julias focus area, where there is a lot of good libraries.