The one that completely solidified my love for Online.net was last April 1st. They had an additional option "Selfie - €0.00" when ordering a server
I just compared both services to find a new VPS provider and decided in favour of Hetzner. Why do you think online.net looks better?
My main problem with online was the poor IOPS performance due to non-local SSDs. But maybe my test was just on the wrong node?
What caught my eye is, if you scroll down long enough on dedicated servers page [1], you will eventually see GaaS - "Geek As A Service". This made me giggle far more than I am wiling to admit :)
[1]: https://www.online.net/en/dedicated-server