To me, the Galaxy S10e is the best Galaxy phone of the bunch. Sure, you get a little more with the larger Galaxy phones, but you also have to pay more for those, and I actually thought the other phones were a little too big for me.
The 5.8-inch Galaxy S10e doesn't feel "small" by any means — again, it looks almost identical to Apple's iPhone XS — but it also feels like there's no wasted space. The other phones have bigger batteries (and presumably better battery life), but I don't feel like I'd be missing out on any features if I bought the Galaxy S10e. It was the most comfortable phone to hold, and it's the phone I could envision myself buying if I wanted one of these three phones.
You can't go wrong with any of the new Galaxy phones, but to me, the Galaxy S10e is the clear winner. It has a gorgeous display, a great camera system, and achieves the perfect balance of price and features for most people.