I’ve had good luck with the Winchester Long Beards and bought some for my daughter to use in her 20 this spring.
This is where my search would begin and probably end. They pattern great and are half the price of the TSS loads
The Winchester Long Beard's are certainly best-in-class lead shells. For the 20ga, to get reasonable pattern density, the #6s are best option given the 1.25oz payload. I pattered a box of them and they were solid 40yd shells.
Now, TSS is obviously way more expensive. However, it'll easily give 10yd more range with a 1-3/8oz load and the heavier loadings will take you to 55yd+. Just by extending the range to 50yd, that's 60% improvement in reach based on square yards covered. Whether that performance improvement is worth it is obviously debatable.
