The Minolta AF 75-300 mm 'Beercan' used to be my workhorse telephoto lens on both the Konica-Minolta Dynax 7D and Sony Alpha 900 ... until I got the Sony SAL 70-400 mm G SSM which is even better but also significantly bigger and heavier.
I compared the AF 75-300 to its own successor models of the same zoom range (several of them), to the AF 100-300, and to the AF Apo 100-300. I found the Beercan the best, overall, of all these. Only at 300 mm specifically, the AF Apo 100-300 outperforms the Beercan; however it's worse than the Beercan at 100 mm and 200 mm. So if the performance at 300 mm is paramount then get the AF Apo 100-300 (w/ or w/o '(D)' doesn't matter but 'Apo' is important). If overall performance across the whole zoom range is important then better get the AF 75-300 'Beercan'; it's better than the AF Apo 100-300 over the better part of the zoom range and only slightly inferior at 300 mm. Also the shorter short end (75 mm vs. 100 mm) is very useful ... to me anyway.
Steer clear from the other AF 75-300 non-Beercan models as well as from the AF 100-300 non-Apo. The Sony SAL DT 55-300 SAM sure is an interesting alternative when the budget is limited—but keep in mind this one is for APS-C format only; it does not cover the 35-mm full-frame format (which is perfectly fine unless you plan to acquire an A99 anytime soon).