OS and Machine issue

Hello Srcds friends,

I use Centos 64-Bit and Debian 64-Bit, and they told me that Centos is the best, is this true?

I also have two machines PE2950 II, with the following settings:

# 1 PE 2950 II
Processor: 2x Intel XEON E5335 Quad Core - 2.0Ghz | 8MB CACHE | FSB 1333Mhz
Memory: 8GB DDR2 ECC PC-5300
Disk: 73GB SAS 15K

# 2 PE 2950 II
Processor: 2x Intel XEON E5310 Quad Core - 1.6Ghz | 8MB CACHE | FSB 1066Mhz
Memory: 8GB DDR2 ECC PC-5300
Disk: 73GB SAS 15K

Each machine has a 25MB of dedicated upload.

I run from 5 to 7 servers CSS/TF2 them, correct?

Thanks for help.