HP-38 and Hi-Skor 800-X.
In my opinion, 800-X is a highly under-rated powder. It is a powder with large flakes of irregular size and shape so it is very hard to get consistent charges through a volumetric powder measure. I throw each charge light and then trickle up to the desired weight. I load in batches of 50 or 100 cartridges, so I can tolerate such a slow process.
I'm also in the process of working up loads for both using Bullseye which (along with its "replacement" Sport Pistol) is, I think, one of the most versatile pistol powders going. For everything I shoot (25 ACP, 9mm, 38 Spl, 45 ACP), there's a Bullseye loading for it.