Which lens to get? (two linked in body)

[Radium_Angel]

On a Crop body, Canon 1D Mark II N

https://www.ebay.com/itm/Tamron-SP-70-200mm-f-2-8-USD-Di-VC-A009-Telephoto-Zoom-Lens-for-Canon-EF-P6979/233606447711?hash=item366407825f%3Ag%3AaCoAAOSwgMxe1R51&LH_BIN=1

 

or 

 

https://www.ebay.com/itm/Canon-EF-70-200mm-F4-L-IS-USM-Lens-Certified-Pre-Owned/154016203804?hash=item23dc14c41c%3Ag%3A~AYAAOSwcLRfFfdO&LH_BIN=1

 

I know the L glass has a reputation, and the loss of a stop (2.8 to 4) doesn't bother me. Both are about the same price (looking to spend around 800$ max) but if there are better options on eBay (USA only, please) I'm all ears.

Look for reach, hence the 70-200 with a fast aperture, but I"m open to other options.

[GDRRiley]

I did a little digging on lensauthority  (used rental gear) and found these as options

https://www.lensauthority.com/products/sigma-70-200mm-f-2-8-dg-apo-hsm-os-for-canon\

https://www.lensauthority.com/products/canon-70-200mm-f-slash-2-dot-8l-7

https://www.lensauthority.com/products/sigma-50-500mm-f-4-5-6-3-dg-hsm-apo-os-for-canon

https://www.lensauthority.com/products/canon-70-300mm-f-slash-4-5-dot-6l-is-usm

 

straight from sigma

https://www.sigmaphoto.com/150-600mm-f5-63-dg-os-hsm-c-refurbished

[Electronics Wizardy]

I have the 70-200m L IS f4, and its a great lens. Very sharp, No real issues. Very little chromatic aberration. I haven't used the tamron lense, but have had great luck with all the L lenses I have used.

[ThePointblank]

That's the old Tamron, which isn't as good. Would recommend you stay away from it. The updated G2 version is much better.

[YellowJersey]

I looked up the IQ for both lenses here: https://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=404&Camera=979&Sample=0&FLI=0&API=0&LensComp=833&CameraComp=0&FLIComp=0&APIComp=0

 

 I'd say IQ is pretty much a wash between the two, so it would make sense to go with the Canon as you'd probably get better AF with a Canon lens on a Canon body. I also looked up the Tamron 70-200mm f/4, but the Canon looked sharper.