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Chris with nichrome wire it just depends on where you fit it.
If you fit it in front of the mirror in the dewshield it will heat the air and not the mirror.
Resistors are in principel the same as nichrome wire only bulkier.
When you fit resistors on the tube it will heat the tube the same as nichrome wire.
Nichrome wire will look better than resistors and you can regulate the heat the same.
When you have say 10 windings of wire you could tap it in the middle and have more heat with the same voltage or just use pulse width modulated power and have any heat setting as you like.
On dobsonians you can run the wire on top or under the spider (insulated) and gently heat the secondary by glueing a coil on the back of the mirror.
The same can be done with the primary mirror.
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