Personally, I’d say aim for a bitch - it’s quite a few kilos less of a dog to handle!
My girl was amazing in lots of ways. No prey drive - lived with two cats (was shit scared of one of them!). Very low propensity for barking - neighbours either side have small barky dogs, she never reacted. In fact, it was so unusual to hear her bark that, when she did, it made me jump!
She haddoggy daycare from a very young age (the people who ran it had Leo’s themselves), so she was exposed to various types of dogs from early on. She was always fantastic with any dog, young or old.
She wasn’t without her issues. She was not the “typical” that’s detailed on many breed info sites. She was wary of people until she knew them. She was ok with cars, but hated anything else on wheels - scooters, bikes, motorbikes, etc.
The fur would fill a king size duvet (and more). It’s a sight to behold after a quick grooming session when they’re blowing their coat for the summer! The good thing is, they don’t drool. They will, however, forget to close their gobs after drinking, so trail water everywhere. My girl discovered the fact that she could blow bubbles in her water bowl - she found it very entertaining. And she loved the hose coming out in the summer - as soon as the tap was turned on, she’d sit to attention waiting to grab the water coming out!
Sadly, I lost her just before Christmas - she was 9.5 which is pretty good for a Leo. Due to personal circumstances, I don’t think I’ll be able to have a dog again. But, if I could, I’d have another Leo in a heartbeat.