Should of came to our meeting thursday night, would of had a very expert fisherman to ask that question too.  I'm sure someone here can help you just as well though.

Fiberglass has been the accepted norm for several years now due to it's reletive slow sensitivity transmission which results in deeper hooksets.   Moreover there is less chance of tearing the hooks out of a less than idealy hooked fish. 
Many rod companies are offering various types of glass or composite fiberglass/graphite rods to fill this popular nich.  Often you can still use a 100% graphite rod and achieve virtually the same effect by "softening or slowing down" the action. In other words using a Medium action rod with a long taper vs. a medium heavy rod with a fast or very fast action.
There are too many variables in rod actions and tapers for me to discuss here.
Stop by the Shimano booth at the Puyallup Sportsmans's Show this week and I'll be happy to show you several examples. 8)

Smitty

I would agree with you there Glenn. I do like a 7ft rod though when I'm throwing in more open areas or covering a flat because of the longer cast.

I'd go with carbon for either. They would be two different rods. For spinnerbaits, a 6' trigger stick is the best way to go. I'd like to be able to throw a nominal 1/4 > 1/2 oz spinnerbait. Be aware that they are usually about 1/4 oz heavier than their rated weight. Apparently the nominal weight is the weight of the head, and everything else adds onto that. Goofy.

For Crankin', I'd like to throw 1/4 > 1/2 oz cranks. I don't fish many lakes that aren't pretty clear, anyway, when compared to the ones they always yak about in BassMasters, and smaller cranks generally work better. Phil H. let me use his G.Loomis cranking rod one day, and I gotta say, they are sweet, tho expensive IMO. Go for 7', Med. or Med. Lt. Look at the lure weight.  I would look around at other rods; Quantum and Shimano are my favorites, but I do like the humped handles of most the BPS lineup. A 5:1 Curado would be a perfect match.

I will tell you that your mistaken about the difference. Most big time crankers like fiberglass for a reason. THat reason is that glass gives a slow motion. Plus a fiberglass rod will throw a crankbait half a mile without a hole lot of effort. Maybe it won't quite throw your crankbait that fair but it will cast it a long ways. If you want some info on some good glass rods. You can IM me.

Hey Y2SAYS, a fiberglass rod has some advantages that people have recognized, but it doesn't mean you have to have won. You may never loose a fish with a graphite. Some just like them better. I cranked with a medium heavy graphite rod for a long time and didn't have issues. It wasn't until I tried and fished with a fiberglass for 2-3 years before I determined I liked it. I actually liked my 7ft Castaway crankin rod which was made of graphite better than the glass rod I have now. I just happen to break it in my Jeep door.  You just want a rod that flexes easier. A graphite rod made for cranking is made to flex like a glass rod and wont pull the hooks out.

I once owned a graphite/fiberglass composite for crankbaiting, and was fairly happy with it.  Then one fateful day, John Holland let me try out his G-Loomis crankbait rod.

OMG!!!    Absolutely amazing!

I now own one, paired with a Shimano Chronarch reel, and it's the smoothest setup I own.  I love it! I can cast 1/8oz lures long distances with ease (not even a hint of a backlash). 

It acts like a fiberglass, in that it has that famous fiberglass-like give to it.  Yet it has the strength, sensitivity, and durability of a graphic rod.  The best of both worlds.

Keri tried it, and after one cast, turned to me and said, "Oh you SUCK!!"