Well, Clutch, I have several of all kinds. When I get to changing tires, i need all I can get.

The "curved" end irons -if I get your description correctly- do a nice job of holding onto the wheel rim. Sometimes when the bead pops over, the curved iron may get trapped. Grrr...
"Straight" is just that. It's the
proper substitute for a screwdriver. And the spoon end iron has a bit wider working surface and a gentle curve that can assist the bead over the rim nicely.
I still have my OE Triumph tire irons out of my 1953 Turnip. Of course, they are Whitworth and totally unusable on metric bikes. [smiley=mad.gif]
Harbor Freight recently had a sale on a tire iron that I had to have... that puppy is well over two feet long! Just imagine what I can screw up with that.
Look for irons that have a smooth working surface and a nicely tapered end. Buy some of each. Your buddies will like you for it and you can have your own
tire tech days in your garage.
Monte