RT vs DT any difference? Future of RT. Great if you could comment Mark F

I’ve already asked this but had no response so I’ll try in RT forum and see if anyone can help

I’ve looked at RT theme and apart from header layout and some layout differences (which can be changed anyway) I can’t see any real difference between this theme and DT.
Is there any additional functionality that RT offers (eg. different search options) or is it just DT laid out slightly differently?

Mark F, is it possible to let me know if there are any functionality differences as I’m starting a new project and want to know if there’s any point using RT over DT.

Also are there any plans for other features for RT which would make it different. eg. availability calendar and being able to search by availability? Or anything else?

Or will it always be very similar to DT?

Also grateful for any comments from anyone who has used both themes.