Would it be better to get a Spinning bike or tri bike on trainer?

 That's the same one that I'd get if I get a trainer. 

Here is an excerpt from a thread in ST

"the wear and tear of riding on the trainer is probably less than on the road, but why use your bike for both. by not using the bike on the trainer the chain and cassette will last longer because it's used less.
the main killer of the drivetrain is dirt and crap getting in it from on the road. a spin bike's chain will probably last a lifetime.

on a trainer you sweat a lot and it can get into everything, you have to be careful to clean the bike regularly. spin bikes are usually more robust and have few nuts and bolts to worry about.

to me it's the hassle factor. if i wake up and it's down rain i just jump on the spin bike. no changing wheels, no putting the bike in the stand. it's easy. also, i like to do specific workout sometimes, such as sprints and standing climbs. this is no problem on a spin bike (although you can't rock it side to side on the climbs) but it could cause some excess wear on a regular bike in a trainer. i wouldn't do hard standing climbs on a bike locked into a trainer. JMHO. not to rant but i also find setting resistance easier on a spin bike. on a road bike you jump 5-9% with each gear change (can be less if you do a double shift - front and rear) on a spin bike you can fine tune the tension very easily."

I was just looking to see what your guys thought of the pros and cons of a spinner versus the trainer.

-Nick