I would vote for T300's but getting properly fit is the key.

Whatever you are fitted for. IMO

Another vote here for T300s

I would also vote T300 if you can get them. I ordered the 2021 T300 with Tensi red graphite regular shaft last September 2020. It's been seven (7) months now and I still have no idea on when they will be shipped. I was hoping to find out how good these irons are. I'm not very optimistic about ever finding that out.

Take Fred's advice and go for a fitting. If you're a "green grass" pro shop man, it should be easy to find a Titleist demo/fitting day around you. If not, hit up a Golf Galaxy, Club Champion, PGA Superstore, or similar to get fit for what works best for you

Based on data at a fitting by my Titleist fitter who has over thirty years experience, I play T300s, with True Temper AMT Red R300 shafts. At 75 need all the help I can get. Not all of us at the same. Save yourself dollars and get fit.