The khao soi here and at Sukho Thai tastes the closest to what I had while I was in Thailand (Phuket) and brings back memories every time! Sometimes I switch it up and order Chef Nuit's pad thai if I want something lighter.
I personally find Pai and Sukhothai to be on par in terms of taste and portion for their khao soi. I just end up going to Sukho Thai more often since it's closer to my office.. but I end up at Pai if I'm closer to the Entertainment District.
Once in a while I will order their thai iced tea, but it can be overly sweet and you can't customize the sugar level since it's made in batches ahead of time. I've tried their mango and sticky rice with coconut sauce also and it's pretty good.