Does the ereader matter if I don't use the subscription?

I'm torn between buying a kindle vs a kobo and keep hearing that kobo is better except the book selection isn't great. I'd rather not get a kindle because they won't let you download the books anymore but if kobo won't have the books I want anyway then I'll just get a kindle, but I can't figure out if the lack of selection people are talking about is through the subscriptions or if they're literally not available for purchase. I'm also in Australia so I'm not sure what the difference is vs USA. Plus with kobo I could use Libby but again I'm not sure how that works. I tend to buy all my books out of convenience so if it's just the subscriptions it doesn't really bother me.