It would be the 28 for me. With sustained fire both will eat barrels, the 28 will do it a little slower. Both have great ballistics, I just think the 26 is too much of a fire breathing monster for my taste.
284 cal also has heavier bullet offerings, better for bigger critters.
For up close shots you are definitely going to want a premium bullet, most likely a mono, so it will hold together.
I have neither and no use for either, not saying they’re bad, just not for me.
That’s my take