Now, you might be thinking the Cybermen have more in common, but when you think about it from a different, less cosmetic POV....
-Both are more popular attempts at a new villain in a new franchise show other than returning classics (Klingons, Romulans/Daleks, Cybermen) or the initial recurring bad guys (Ferengi/Slitheen) who were more obnoxious than scary.
-Both have been retconned in their second appearence. Originally, the Angels teleported you to the past and feed on your time energy-the years you would've had. However for Time Of Angels they seemed just to kill outright. Likewise, the Borg initially seemed interested only in technology and didn't need humans. However Best of Both Worlds had them suddenly become interested in humans.
-Both are largely silent, requiring someone with knowledge to explain them initially (Q/The Doctor) and secondly, a converted human representative (Locutus/Angel Bob).
-Both are more popular attempts at a new villain in a new franchise show other than returning classics (Klingons, Romulans/Daleks, Cybermen) or the initial recurring bad guys (Ferengi/Slitheen) who were more obnoxious than scary.
-Both have been retconned in their second appearence. Originally, the Angels teleported you to the past and feed on your time energy-the years you would've had. However for Time Of Angels they seemed just to kill outright. Likewise, the Borg initially seemed interested only in technology and didn't need humans. However Best of Both Worlds had them suddenly become interested in humans.
-Both are largely silent, requiring someone with knowledge to explain them initially (Q/The Doctor) and secondly, a converted human representative (Locutus/Angel Bob).