From my experience Cs loxinfo is the best provider (fairly price and good support ) , but they can't provide optical cables that area only radio link (limit to improvement in the future).
For TT&T the telecom solutions is a main product the internet connection is the second one. They are no. 3 or 4 in Thailand for a solution of link data connection. the internet connection not popular for business used. the mostly for home used, but in that area they're better CAT telecom. CAT telecom is last choice for me. They big provider in Thailand, but not good for end user. They are good for other provider which need to sharing their line, because it's their business.
For comparison TT&T and Cs loxinfo. I think, TT&T is better CS loxinfo for our case, because they have optical fiber (8-12 connections for us) it will be enough for improvement in the future and the connection will be stable for our operation. Both provide have SLA which the same one little bit different.
For the decide we have to waiting the price detail from TT&T before.