289 can remember AC/DC setup even after reboot. It also offers dual display, so you can use it to display AC and DC components separately.
It also has higher basic accuracy than 87V, 87V is rated 0.05%+1dgt, 289 is rated 0.025%+2dgt if my memory serves me correctly.
Imo, as I own both, 28x (287 or 289) is not the same league compared to 87V, as 28X will take a while to boot, not long though, like 2 or 3 seconds, while 87V is instantaneously ready to serve once you turned it on.
Also the 28X display, as its graphical LCD, the contrast and the "blackness" (or darkness
) of the lcd segments just can not beat 87V.
Feature wise, if you don't need graphical chart, logging and etc, 28X is overkill, and also size wise, holding 28X feel like a big brick, compared to 87V that feels more compact, this photo should be clear enough to show what I mean.