What's your favorite blockchain platform to actually use?

I feel like this isn't talked about enough. It seems like most of the discussions here are about "price go up", which I totally get, but I'd love to hear more discussion about utility and usability of these blockchains that we're investing in. Obviously, Ethereum is the largest blockchain that utilizes smart contracts and DApps, but there are a bunch of other ones out there that offer similar utility. While I personally don't have a lot of experience with any of these platforms, I'd love to hear from people what their favorite platforms are to use. For example, which platforms feel the most fluid? Which ones are the fastest? Most secure? Lowest fees? I look forward to hearing your responses!