So I just came back from dim sum at Mr. Chu's based on strong recommendations from very reliable sources on this board. It was decent but I didn't find it better than Jumbo for the basics. In fact, Jumbo does a better shrimp dumpling, steamed shanghai soup bun, pan fried shrimp and leek dumpling, and sticky rice in lotus leaves at 1/3 of the cost. Mr. Chu's offers more of a high end selection with their scallop and king crab dumplings which are nice but a little steep at $6/pop.
The shrimp dumplings contained two whole shrimp which were a bit over cooked so they were a little shrunken and not juicy. The skin was also a little slick but that's being picky. The shanghai soup bun at Mr. Chu's was a huge wad of pork with no soup. Great for the South Beach diet but bad for me. Finally, the pan fried shrimp and leek dumplings were generously filled with leeks and shrimp but about 3x larger than normal. It makes it impossible to bite into the dumpling without spilling the contents across your plate. The tofu skin rolls were very good though.
Mr. Chu's does carts while Jumbo's are steamed to order. I prefer the latter because each dish arrives fresh. For proximity and convienience and for the scallop and king crab dumplings, I may go back to Mr. Chu's. However, I prefer Jumbo for the basics and for the more "traditional" pricing.