They are very different bikes and both excellent. The Roadeo is a very traditional, conventional, but mature road racing bike. I have no doubt in my mind that if we had a time machine and swapped Greg Lemond's Della Santa with a Roadeo, he would have have won the same races. If we gave Miguel Indurain a 21 pound Roadeo to replace his 24 pound Banesto bike, he would have still won the tour de France several times. The Roadeo is a race bike. If you want a race bike and do the fun kind of riding that people do on a race bike, it's a spectacular bike for that. Traditional, conventional, optimized, stunningly beautiful, masterfully crafted RACE BIKE.
The Leo Roadini is an evolved road bike. If your approach to road riding is more relaxed than a real race bike kind of approach, you might prefer it. The bars will be higher. I ran my bars slammed and they were still high. It feels less racy, it is more comforable. I felt I was in a sofa it was so easy and leisurely, and for me the surprise was it was objectively faster. Faster or not, more comfortable or not, it did not feel like I was racing. People who want their road bike to feel like they are racing might be turned off to it. Defintiely people who want a traditional, conventional race bike look are pretty consistently turned off by the Roadini.
If you need you bike to feel like a race bike, you will likely prefer the Roadeo. If you need your bike to look like a race bike, you almost certainly will prefer the Roadeo. If your strength and flexibility demand that you get the bars low, your will definitely prefer the Roadeo.
If you are looking for a more evolved and dignified 'just ride' approach to paved riding that costs ~$1800 less and may be measurably faster for you, then the Leo is a good option.
Why do I have a Roadeo when the Leo was so good? I want a race bike in my stable. I actually have three race bikes in my stable. The Roadeo is a race bike. The Legolas is a race bike. My hard tail mountain bike is a race bike. I use them for rides that are fun to do on a race bike. The race bike slots in my stable are far more "toy" slots than "tool" slots. I own them because they are fun to own, and fun to ride. If I moved to a one-bike living situation, all my race bikes would be out the door. That's a fact. I'd likely keep a brevet bike that can do errands, commuting, road rides, touring, and light trail stuff. That may be my current Sam Hillborne, or it could be my actual brevet bike, a Norther Lyon.