General Cycling Discussion - Fixed Gear or Road Bikes on Bike Trainer?

Does anyone know the advantages and disadvantages to using a fixed gear on a bike trainer as opposed to a geared road bike on a bike trainer? From the research that I did the fixed bike won't help my cadence, but I'm really only using the indoor trainer to get some additional exercise from time to time. I was thinking that the road bike would give me much better cardio and strength training since I have the option of putting it into high gears.

adjustable resistance levels, other than a wind resistance fan, ie magnets or fluid..
would make the single speed bike usable,
so pick the trainer stand, around the resistance adjustability and type.

Thanks for the reply. I just got a used Travel Trac Century V Fluid Trainer. It doesn't reference adjustable resistance levels in the manual so I guess this is not an option. It does say in the manual that to simulate climbing hills the user would need to change to a higher gear so I'm still thinking that the geared road bike would be ideal since I can't simulate hills on the fixed gear. I was hoping that the fixed gear would still give a decent workout. I guess I'll just have to try it out.

Fluid trainers are generally not adjustable. This is because the physics of teh fluid resistance unit increases drag with speed following a rule very similar to the air you ride through on the road. if you want more drag or to work harder, pedal harder and shift gears accordingly, just like on the road. Seems like a fluid is less suited to fixie training, perhaps.

Either of them would work better outside.

Fluid trainers are generally not adjustable. This is because the physics of teh fluid resistance unit increases drag with speed following a rule very similar to the air you ride through on the road. if you want more drag or to work harder, pedal harder and shift gears accordingly, just like on the road. Seems like a fluid is less suited to fixie training, perhaps.

Thanks. I tried the fixed in the trainer and it didnt seem to provide a great workout.

Fixed gear in the trainer over the winter helped my spin on the road bike come spring.

Thanks for the reply. I just got a used Travel Trac Century V Fluid Trainer. Thanks. I tried the fixed in the trainer and it didnt seem to provide a great workout.
Oh well ,. then you need multiple gear ratios.. only got a fixie bike?
you change ratios with the change of cogs, chainrings and the chain length..

maybe a 13-50t combination?
chainrings are made even bigger.. in 3/ 32" thickness..
64t perhaps?

or an internal gear hub wheel.. x1.33..