Most productive red fleshed sweet potato varieties?

[uno]

I tried growing sweet potatoes many years ago, I grew white fleshed ones and they didn't do very well for me.

I love sweet potatoes though and I would like to grow them if I could more yield for my effort it would be great....I always had trouble with root crops here probably due to the heavy clay soil.

So just wondering what some of the highest yielding red fleshed sweet potato varieties are that others here have grown?

If I give them another try this year I will plant some of those and see how it goes.

Thanks

Jim