The 2nd one is "default"? In the U. S., I don't I've ever seen a peeler that wasn't like your first link. That, or I just never recognized the second link as a peeler. Looks kind of like a cheese slicer to me. :-)

Over here (Europe) the second one is all over the place.

The straight style is more common in US home kitchens; the Y-shaped style seems to be more common in Europe. In the US there has been a trend of chefs and food writers evangelizing the Y-shaped peeler.

In my experience the straight style is more ergonomic for carrots and parsnips whereas the Y-peeler works better for potatoes, citrus, and other roughly spheroidal foods.

(I also use my [very sharp] Y-peeler for shaving hard cheeses into flakes so sure, I guess it is a cheese slicer too :) )

Whilst simultaneously realising the absurdity of the topic, I feel compelled to say how much easier the second style is to use - a thought I've oddly had more than once.

I like to cook with my child, they were able to peel carrots at age three using one, albeit with me holding the carrot!

Never found a butter knife to be much of a challenge. And somebody challenged by simple utensils should probably not be trusted with one of those things :)