I’ve only been to 2 okonomiyaki specialty stores in sg - ajiya and seiwaa, and I much preferred ajiya.

The okonomiyaki here has a nice crispy base (formed mostly by the pork belly), and as it’s left on the heated countertop it remains piping hot throughout your meal. It’s creamy but not in a cloying manner, and flavourful - there’s sweet, savoury, and tangy. Wouldn’t be complete without okonomiyaki sauce and bonito flakes! I find it a little pricey given the ingredients (only 3-4 thin slices of pork belly, some tako and the various veggies in the eggy batter) but it was very enjoyable.