Assuming this is serious...
First off, sounds like you have telescopes, not microscopes. Microscopes are for looking at wee little stuff down here. Telescopes are for looking at way big stuff out there.
Secondly, neither is "big" as scopes go. These are small telescopes. The C90 might bring as much as a couple of hundred bucks depending on condition and configuration (does it have the mount/drive base?).
As for the TeleVue. Depends on which one it is. First thing to do is determine how big it is. 880mm is its focal length. What matters is the size (diameter of the main lens). Depending on that size and the model, it can be worth a couple of hundred to considerably more.
As for the lenses, the eyepieces, how much they are worth depends on exactly what kind they are. Model and maker.