Both are from 'Hublot' factory, but they are different watches.
Do you like chrono or no chrono? Titanium or steel? Sandwich or sausage dial? Automatic or manual wind?
Both are quite accurate reps. From the display back both have inaccuracies.
Both have colourless AR and good lume.
253 comes with mineral crystal rather than sapphire crystal of gen.
253 isn't a real flyback.
If you can live with the mineral glass crystal only question is which one you like the look of more.
Consider the 005K with a closed caseback and a sausage dial.
as always, choose one of the dealers from the
list.
Any one should be able to get what you want.