need opinions on which mower to purchase, X740 used, X540 or X710

[cca50]

A little off track but can the blades be changed without having to remove the deck? With my mower, I can use a floor jack to raise it high enough to to remove and reinstall blades, using a 3/8" impact. Much easier and quicker than deck removal. I had not even thought about that.
Thanks for all the input.