I see lots of discussion about feature comparisons to competitors like about.me, linktree, but for me, the critical component for this kind of product is the organization behind the product: do they commit to hosting the site indefinitely, and are they stable, mature, and trustworthy enough to follow through on that commitment? Does the organization behind the product have long-term financial sustainability, or is there a risk that they could fail like 90+% of startups fail? Is the organization notorious for suddenly sunsetting popular products for no good reason (see Google)?
For example, I trust Microsoft to keep GitHub Pages running in its current form indefinitely (edit: or to sunset it with such advance notice that it won't be a crisis), although the me of 20 years ago would slap myself for saying this. I just don't trust what appears to be a single freelancer who has one active product in their resume. I've been that freelancer trying to build out a portfolio with free services like this. I regret it, and everyone who trusted me regretted it too.