Which part is slower? After having created large templates in Logic, Studio One, Cubase, and Pro Tools, and working heavily in all of them for a while I much prefer the reliability and workflow with VEP in Pro Tools over those others. Without VEP, I think Logic probably is winner here however.
Certainly with HDX I don't need to worry about the buffer and generally keep it at 256 through an entire project, but in general I find similar buffer settings provide similar native performance across all the DAWS (maybe Logic is a little more efficient, although the single core spiking issue persists).