If trish and sam get married they will end up arguing and fighting all their life and trish will not be able to make him see things or change him even a bit,
while urmi though is vocal but not as much and as blunt and in the face like trish, so with her calm ness this gal can knock sense into his mind as at times she can get stubborn too and we will see it how, while with trish and sam it will be blame game or its my way or urs like their first meet and with urmi and sam it will be same but eventually urmi will be able to convey her point to him which he have to listen in a manner which will be different .
ishan and trish make good pair , said this from day1, as both see world in a manner in which its more sweet and understanding