If you have a generally cooperative group with communal goals, you often get magic items handed out on ability to use, not on individual desire.
In that kind of situation there is a basic question that comes up - who gets the item? Who really exemplifies the "best" choice to maximize the value of a magical item?
The Belt of Might +3 the PCs picked up in our last game session is a good example of this debate. But so does any number of magical weapons, protective amulets, offensive wands, and so on. Who gets it?
Shore up weakness?
This school of thought says that magic items are great ways to bring up lagging party members. Have someone vulnerable to magic? Give him the item that helps him resist magic. Have someone who fights pretty well but lacks hitting power? Give him the shiny new magical weapon and enhance that hitting power. Have someone who lags in ST behind the rest of the party? Give him the ST booster. And so on. Use the magical item to make your weaker guys less weak, or plug holes on guys with gaping gaps in their abilities.
Conversely, this school of thought say that you best take advantage of a magical item if you give it to the character who best exemplifies that trait. Magical sword of smiting? Give it to the stronger swordsman in the group, so you have enormous one-punch power against boss-level foes. Belt of strength? Give it to the strongest, to make for a truly awesomely strong guy who can bash down doors, smash foes, and lift portcullises. Have a guy with excellent anti-magical defenses? Give him the magic resistance amulet, so he can be your point man against Mind Control wizards and those all-too-charming vampires. And so on - the best place for your best item is on your best guy.
Only consider maximal use?
If the item is used effectively by anyone but with a special bonus by another, does that special bonus trump all other considerations? For example, and item that gets a bonus for a specific Talent or trait, but functions just fine for everyone. Do you only consider the person with the best ability to maximize the effectiveness of the item?
Find a novel use?
For example, with that belt - it's +3 to Striking ST and Lifting ST, effectively (it's +3 ST, without HP). Why not give it to a wizard or cleric, so they can wear heavier armor? Why not bring it along as a booster to henchmen who carry loot and haul wounded companions?
I think this is an interesting debate to witness - in a sense, none of those are wrong uses. None of them are really poorer choices than the others. It's just how you choose to maximize the bonus you found.
On a related note, this post suggests some ways to prevent the choice of "all of the above, as needed, on the fly."