I've found them to be different, not always "better". As klpca says if you try and request you will struggle to get through the restrictions to find dates that work, it can be frustrating, but can be done. In reality inventory that is on the restriction list does routinely come up, so its a question of whether you want to give a request a go, but then check manually as often as you can.
I find that these ones have quite decent inventory far out, so you should be able to see MTU (Morritts Grand Cayman) 1-beds and studios through Nov and Dec 2026. Another example is: In Sept 2025, I got a 2-bed at one of the MVC's in Spain for end April 2026 using one, but in previous years they've shown up on the random ones and not the promo ones. I've not had one match a request so far, and I've extended and successfully used them when I was after target inventory that is reliably available with them. When I've extended them I make the decision within a few weeks of getting them so the 12 month window rolls immediately and picks up new inventory as it goes in. If you leave it within 30 day to extend it will be limited to the flexchange window
Basically, try and avoid getting locked into thinking one type is "better" than another, as it really depends on what you are looking for, and don't assume the inventory out at 10-12 months isn't any good.