geylang serai hawker center! 
the one at simon road one i feel is one of the best, its not those
kinda normal nua nua orh lua, its abit crispy one, though abit oily
as mentioned, but real nice.
the serangoon garden orh lua i feel its average only, everywhere
oso the same, if u try geyland serai and simon road's orh lua u'll
noe the difference.