There are basically a shitload of datacenters in Frankfurt so I won't talk about every DC, but more of a general overview. It doesn't matter what your budget is or what your requirements are, you will find a DC in Frankfurt.
You basically have the big brands like Equinix (7 facilities in Frankfurt), Interxion (They are currently building their 11th facility in Frankfurt), Telecity (now part of Equinix) but also some local ones like e-Shelter, First Colo or Accelerated. There is also a DC only meters away from the Interxion campus that is called Interwerk and is basically the cheapest DC in Frankfurt, but it has an awesome price/performance ratio and you have access to all peering/transit options of Interxion (via CWDM) and can get a 1/1 rack for under 200 EUR/mo. I have been in that DC for several years and never had a single issue, so if you don't rely on any certificates this is a cheap option.
I was also colocating in the First Colo DC for some time, they are also in the locality around the Interxion campus. It's a pretty small DC but it is more premium than the Interwerk and also is kinda cheap. I personally wouldn't go with Accelerated, since they had multiple issues in the past.
For the big brands I would definitely go with Interxion, they are great, have all the certificates and are premium while not going crazy with their pricing like Equinix does. DigitalOcean, Twitch, etc. they are all in one of the many Interxion facilities in Frankfurt. If Price isn't a concern I would probably go with Equinix FRA5.
DE-CIX is present in around 7 facilities, 3 of them are Interxion and I think 2 Equinix.
You basically have the big brands like Equinix (7 facilities in Frankfurt), Interxion (They are currently building their 11th facility in Frankfurt), Telecity (now part of Equinix) but also some local ones like e-Shelter, First Colo or Accelerated. There is also a DC only meters away from the Interxion campus that is called Interwerk and is basically the cheapest DC in Frankfurt, but it has an awesome price/performance ratio and you have access to all peering/transit options of Interxion (via CWDM) and can get a 1/1 rack for under 200 EUR/mo. I have been in that DC for several years and never had a single issue, so if you don't rely on any certificates this is a cheap option.
I was also colocating in the First Colo DC for some time, they are also in the locality around the Interxion campus. It's a pretty small DC but it is more premium than the Interwerk and also is kinda cheap. I personally wouldn't go with Accelerated, since they had multiple issues in the past.
For the big brands I would definitely go with Interxion, they are great, have all the certificates and are premium while not going crazy with their pricing like Equinix does. DigitalOcean, Twitch, etc. they are all in one of the many Interxion facilities in Frankfurt. If Price isn't a concern I would probably go with Equinix FRA5.
DE-CIX is present in around 7 facilities, 3 of them are Interxion and I think 2 Equinix.