Sinious, what I'm trying to say is that Savage tanking blaster bolts and Dooku's lightning so consistently, conveys the writers intent perfectly: Savage is just that durable. We've seen blaster bolts burn holes right through jedi all throughout canon, and we've seen Dooku's lightning render powerful force users unconscious, without trying to kill them. With that being the case, there's no reason to assume Malgus lightning would do any more damage to Savage than what he's been shown to consistently handle. Malgus's lightning burning holes isn't going to harm Savage more than blaster bolts which have the power to do the same. It doesn't matter if it's lightning or not when the result is the same. However, if you want to get that strict, well, again Savage has shown to tank several blasts of Dooku's lightning, and while Dooku's never shown to burn holes through jedi, he has taken out more powerful jedi with it, without trying to kill them, similar to Vitiate taking out a powerful strike team, without intending to kill them. The best way to compare Malgus's lightning to Dooku's would be to judge it by their opponents, their intents, and similar situations; basically the same way you would do if it were Vitiate. Dooku's comes off as superior to Malgus's.
Regardless, we know Savage can tank powerful lightning, and attacks that cause similar damage to that of Malgus's lightning. All it does is trigger his anger, which won't go well for Malgus.