Hey Andi,
this is a question that every algorithmic trader starts to ask himself at one time, especially after some experience is there. You are there now :)
The best is to combine the two. It is good if you have EAs that perform well for a longer time, and at the same time, you need the EAs that might bring you quick profits in the short term.
As Jacpin says, as far as it is within your rules, keep trading with it. And during this time look for the EAs that you create or you take from me. You do not know which one of those will remain profitable for a long time, so this is the only way to find those best Expert Advisors.