The performance is much more variable in Odyssey - with my setup I rarely drop below 70fps in big station concourses, and comfortably sit at 100+ in outposts. Except when there's glass (although that's admittedly better than it was.)From the streams I have seen performance is similar between SC and ED but you could argue that SC has better graphics and certainly more happening with the terrain, weather etc.
Walking down a ramp and on to the ground is also certainly more immersive than the magic blue circle in ED.
But I'm sure Frontier would do all the interiors etc if they had the time and the money ..
The performance limitations in Odyssey are graphics pipeline and CPU-related - the only time I get real dives these days is when there are a lot of NPCs trying to navigate the terrain/buildings, such as conflict zones. In those situations, performance is effectively unchanged since the alpha, despite my upgrading to a GPU some 50% more powerful than my previous one. In Star Citizen, the issues are server- and network-related. In an always-online-multiplayer game.