Yes, definitely choose the LLCs and Honors housing if you can afford it. Kahlert is brand new and much closer to everything than the regular housing at the top of campus. Lassonde is also generally easier to get into since it is super expensive. But whatever you do, don’t miss the application deadline, even if you haven’t made a final decision to attend. I don’t believe it is first come first served though.
After freshman year most people have to go off campus, but there is at least a chance to get honors housing in MHC or Block 44. If you get a Presidential scholarship with a housing subsidy, I think you are de facto assured to get one of these options all four years. My D18 who just graduated was in MHC years 1, 3 and 4 (before Kahlert opened) and Block 44 year 2.