What DSL modulation is better?

Well im having noise in my phoneline, and so the DSL service is not upto the mark

The line attenuation is get is

US : 12

DS : 20

well now i wanted to know what modulation would be better ADSL G.dmt or ADSL 2 Plus ?? considering i have noise in the phoneline

Ummm... That is quite good line attenuation, actually. It means that there is less signal noise (regardless of audible noise on the phone).

G.DMT is best!

downstream attenuation of only 20

it's excellent