for dimsum landside 3 options

airport - Jade Garden... mainstream ok/good quality

Regal airport hotel (walk 6min). chinese rstaurent i think called rouge... never tried but shud be ok

Marriot skycity hotel - shuttle there... Man Ho chinese restaurent hotel class dim sum actually very nice... also maybe 2x as expensive as Jade Garden.

i would think going to city for dim sum is waste... Jade Garden dos the job or you could walk to Regal hotel if u want hotel atmosphere... going by bus to marriot is trouble.