If you intend not to root, then there are probably no cons to a locked boot loader. You are probably like most people who also will never root, nor ever even know there is something they can do for their phone by rooting. With a locked boot loader, rooting the phone as we came to know and love with the original Droid is not possible. Yes root is available, but that simply lets all of the bloatware crap preloaded be removed. There are apparently ways to work around the locked bootloader with some degree of ROM customization. It is a personal quirk that Motorola's decision angers me past my ability to buy the Droid X. YMMV.
But in your case, never intending to root, and not wanting the Google workarounds, the Droid X may well be your best choice. The screen appearance and/or size of screen will probably be the determining factor, or of course the Google issue. I personally have no problems so far, other than the Market only transferred my purchased apps, not the free apps, through my account. I personally would wish the quick search button to be long gone as I think it is a huge PITA as I am forever inadvertently swiping my thumb over it when scrolling and thus having to back out of an untindended search. I would just as soon take the extra tap to open the browser to do the search. I use Skyfire and Google is default there. ALso the buttons at the bottom of the screen need to stay lit up like the Droid.