What scale is best for a serious diecast collection?

r/Diecast threads generally point to 1:18 as the sweet spot for detailed display models, with entry-level detailed pieces starting around $100 and brands like Kyosho, AUTOart, and CMC at the high end. 1:24 is a more affordable display scale but has fewer premium manufacturers. 1:64 is dominated by Hot Wheels, Matchbox, Mini GT, and Tarmac Works.