If I remember correctly (it has been a while since I looked), Hetzner although is a lot cheaper on the price sheet, they're European region by default and then if you look to get US region servers at Hetzner, the pricing is a lot higher and similar to Digital Ocean. Is that still the case?
For OP though who is a Turkey-based company and want European region servers anyway, it might make sense.
For what I use Hetzner for, and OP from the article, Hetzner only has dedicated servers in Europe, so there really isn't anything to compare to :) If I need dedicated servers in the US, I'd probably go with Vultr.
I think Hetzner makes most sense (for myself, and OP seemingly too) because they have dedicated servers, and they're in Europe. Extra bonus is the unmetered connection, but primarily just good and cheap servers :)