Answer is you should used both. Spinning rods are best of spin casting...ie spoons, spinners, jigs, etc that are casted and retrieved. A baitcast rod is definititely the best for drift fishing. Now when you say drift fishing, I assume you mean float fishing bait, yarn, etc (drift fishing in the US is different than float fishing).
Frankly, you can floss a fish with any type of rod: pin, bait cast, spinning reel and dare I say even fly/spey
Bottom line is that if you sweep your drift through a run opposed to drifting in one lane parallel to shore, then you can floss fish regardless if the rig you are using. No one piece of equipment is more "ethical" than another...just the fisher using the tool.
As such I think it is rediculous to say center pinning is the elovution of a fisherman...thats a laff! I have seen guys with $1000 sages/islander rods, $8 drennan floats (for stealth)
and they are fishing 8 feet of line below their float in a 5 foot run and sweeping a 5 foot leader with a 2/0 hook through schools of fish. The evolution of a fisher in my opinion is a fisher who can walk onto a river in any condition and use an appropriate technique to get a fish to bite.
I have bait cast rods, center pins, spinning rods, fly rods and I often carry 2-3 rods in a rod bag when I am on the river so I can use which ever rod is best sutied to the river conditions, target species, and terminal tackle I am using.
Some clown fishing under KWB with a center pin, a deep float and a long leader is far from what I consider an evolved fisherman