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Personally I don't consider which is cheaper, nor which is easier to take off.
My only concern is which will seal better & last the longest!
IMHO Permatex seals better, is more durable, adapts to irregular/damaged surfaces, and is always the right shape/size.
Just Permatex.
The High-Temp Red RTV stuff.
http://www.permatex.com/products/Automotive/automotive_gasketing/gasket_makers/auto_Permatex_High-Temp_Red_RTV_Silicone_Gasket.htm
Good from -65degreesF to 650degreesF intermittant (WAY More that you'll ever need!).
Resists cracking, shrinking...