Most popular handmade wanton noodles from Pontian, Johor? I don't know that for sure. But I do know they have a branch near SS15, Subang Jaya.
Backed with 60 years of experience of making Wanton noodles, the shop claims the noodles won't get soften even for the take away order and they are selling >1000 bowls a day (all Malaysia branches combined). Anyway, I still prefer to eat in whenever is possible.
The combination of the noodles texture/softness and soya sauce are perfect. It tastes so wonderful. Highly recommended!