They can both be hacked. The biggest differences are UI, 3rd channel on Rigol is not isolated from 2nd channel(share a ground), and siglent is not as flexible on 3rd channel. Unlike what you think it's got the same configuration as other 2 channels. Configure voltage, current, ovp, ocp, and full data visible on screen. For me it ended up coming down to the fact that I prefer to have the numeric entry keypad on the Rigol.