Probably not much help but I did notice that Bella Barista have the QM Rubino LUXE on 'Stock Reduction' for £1050 or so ish, which if money is a factor might help a lot.
The MaraX, Profi 400 and QM were in my shortlist and I couldn't decide between them, so I've done a 180 and ordered the Silvia Pro X. Hoping I've made the right decision but honestly, I don't think you can make a 'wrong' choice here.
What I would say though is that I have a gut feeling that the Profitec might be a bit better built than the Lelit, and now that Lelit is owned by Breville/Sage it's quite possible that the component quality might drop a little bit. They're still great machines from what I can gather (I haven't owned any of them, the Silvia will be my first prosumer machine).
So, I guess the question to ask yourself is how long you want to keep the machine running. If you're envisaging replacing it in 3-5 years then just get whichever one you like the look of/fits the budget the best. If you're planning to keep it running for a decade then maybe the Profi is the way forward... It's where I'd have headed if I hadn't decided I'd rather have a dual boiler.
Agree with
@El carajillo too, I nearly bought from one of the European companies with a UK trading address, but having somewhere with a true UK location that you can send back for warranty repairs etc is definitely worthwhile.
Happy Hunting!