I'm going to go against the crowd and say that I prefer DigiKey and Mouser's sites over McMaster. The filter/apply pattern they use when trying to narrow things down is a lot quicker than waiting for Mcmaster's auto updating window. Usually, when I'm looking for something, it's not for an exact specific item, but to know what options are even there in the first place. Selecting ranges of things in McMaster has always felt a little cumbersome, but Digikey has always had it right.
The other thing McMaster does that's kind of annoying, but also kind of funny, is that they go out of their way to purge the branding of the items they stock. Very understandable why they do that, but sometimes they do it when it doesn't make sense. Want to buy a generic "graphing calculator" for $126 which is definitely not a Texas Instruments TI-83 Plus? Here you go! [1]. Look, you're not fooling anybody here.
The other thing McMaster does that's kind of annoying, but also kind of funny, is that they go out of their way to purge the branding of the items they stock. Very understandable why they do that, but sometimes they do it when it doesn't make sense. Want to buy a generic "graphing calculator" for $126 which is definitely not a Texas Instruments TI-83 Plus? Here you go! [1]. Look, you're not fooling anybody here.
[1] https://www.mcmaster.com/8392T11/