canon 300mm 2.8 is v 150-600 sig or tam

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Name
Dean
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Hi at the moment i am using a 300mm 2.8 is version 1 with a 2x extender for wildlife and BIF although its not a bad set up it isnt the best for focus speed in the future im looking to get a 500mm 0r 600mm prime but will have to wait a while , so what im am asking is would my setup at the moment be better than a sigma 150-600 c or tamron 150-600 g2 or would these be a better option for the time being , i would be using it on a 7d ii and 1dx v1 .
 
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