Here’s my quick update on Dragon Beaux.
I’ve gone to Koi Palace roughly threeish/fourish months ago and thought they were still doing a fine job. A little less innovative in terms of offerings as Dragon Beaux but their execution still seems quite solid. As for Yank Sing, I haven’t gone there in a very long time (at least ten years with my mom and I still recall the price of the meal at 70 bucks for our lunch); however, as @sck noted, HKL2’s price is pretty much on par. Parents recently went and their meal was around 80 for just their small table of 2. They noted that HKL2 was pretty good just expensive. I’d opt to go towards Dragon Beaux since their dining areas are a little larger and price wise, it appears similar if not possibly cheaper.
Lets see… I haven’t had dim sum in Great Eastern for a few years, but it seemed okay with my last visit. Dim sum seems to be more popular at Lai Hong Lounge currently (menu seems very similar to Hong Kong Lounge and I think its by the same group). I had a pretty good time there, nothing too unique in offering but solid execution. A somewhat random recommendation, but New Sun Hong Kong actually has dim sum. They do a pretty good job on this vegetarian rice noodle roll with bamboo shoots, black wood fungus, and mushrooms. Other things dishes are prepped pretty solidly and I tend to go here with family if the lines are way too long at other places, haha.
In any case, out of the ones you were considering, I’d lean towards Dragon Beaux or Koi Palace depending on your group’s familiarity on dim sum. Parking is definitely easier at KP though I would still get there right when it opens otherwise be prepared to wait (well… same advice will be applied on all those that you are considering actually…).
As per other dim sum parlors, if you’re in the area Hong Kong Flower Lounge in Milbrae does a good job same with Tai Wu in the area. I like Tai Yuan in Daly City (especially if you attempt to get a table at KP and fail). Its been a while, but I recall Grand Palace in SSF to be pretty decent.
There are some other restaurants but its been a while so hopefully others can chime in. Some that I can think of is King Wah in Daly City, Asian pearl/The Kitchen in Milbrae, Zen Peninsula in Milbrae. I recall the food being good at Crystal Jade but the prices were spectacularly high (great view of the ferry building) and I have yet to try Hakkasan.