what is the difference to Vertcoin? I see no major change or benefit compared to VTC?
Execoin has a number of differences. It's faster and has more reasonable schedule of N-factor increase. Unlike Vertcoin, we've made our own N-factor schedule, not cloned or taken from anywhere else. If you look at sources, you will find lot of differences.
But yes, both Vertcoin and Execoin are ASIC-resistant and based on the same principle of ASIC-resistance.
I really like the coin and even bought some, but I am a bit worried about diff re-target time.