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Both of the lenses are great, but ideally need to be stopped down a little.
If your not tracking, then you might consider the sigma 14mm 1.8. It’s a big price jump though.
It’s 1/2 to 1 stop faster than the above, and reviews have been good in terms of coma and chroma.
The 1 stop makes a difference, as with your 70d the pixel size means that your limited to 11-13s exposures, for absolutely no trailing (spot stars). Thats using the npf rule, rather than the 500 rule. If you don’t mind a little trailing, then the sigmas advantage lessen.
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