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I'm a veteran hobbyist photography with a so-so photography IQ in the moment, by no means a settings expert. I often shoot landscapes and wildlife, but also will be taking pictures for my university's basketball/football/baseball teams.
I have a Canon Rebel t7i and a 24-105L f/4 IS USM and am looking for a good telephoto - but don't have a bunch of money to splurge on one.
I know in a perfect world I get the Canon 70-200L f2/8 IS USM but that is just too pricey for me. So, I've looked into a variety of alternatives and would love advice based on my budget and the subjects/events I normally shoot: Third Party Lens - Sigma or Tamron nomination 70-200L f/4 IS ll USM 70-200L f/4 USM (no Image Stabilization) 80-200L f2.8 (No IS and no Ultra Sonic Motor)
I would especially love some information about what/where I would by hurt by the lack of a USM.