Welcome Mr-Me..

Actually this depends on the specifications you are opting for in different brand LCDs. the full HD of Samsung will be better than basic Sony... but if you want to choose the one from both with same specifications,,i strongly recommend Sony Bravia..this has amazing picture quality with longer life, thou it will be much more expensive than samsung... also keep in consideration that Sony is Japan made whereas Samsung is Korea !
Iam not much sure about the after sales service, but i have seen the staff at Modern Home more friendly than in Techno Blue.

decision is yours.

all the best. :)