Unity can't really be said to have less or more features than Unreal IMO. Each has features lacked by the other, and neither lacks anything really major. But if I had to pick one for being the most featureful, I'd pick Unreal. Unreal has a built-in visual programming language* and some very advanced rendering tech you might have heard about. Unity has tons of features for 2D games lacking in Unreal and supports WebGL as a build target.

(Though imo unity is the better engine. Unreal has so many bugs and so much jank that to make a real game with it you basically need a large enough team that you can have a dedicated unreal-bug-fixer employee.)

*Technically Unity has a visual scripting language too but IIUC it's tacked on and I've never heard of anyone actually using it.

I'd say Unreal > Unity > Godot for feature space.

For performance/practicality, it's Unity > Godot > Unreal. Building something in Unreal that simply runs with ultra low frame latency is possible, but the way the ecosystem is structured you will be permanently burdened by things like temporal anti-aliasing way before you find your bearings. Unreal and Unity are at odds on MSAA support (Unity has it, Unreal doesn't). MSAA can be king if you have an art team with game dev knowledge from 10+ years ago. Unreal is basically TAA or bust.