Don't really see how you can say they are both "evil" when one side is murdering younglings...
I mean there's really no way to do a "not truly evil, morally grey" take on that, it felt so out of place and was just so damn terrible.
Star Wars itself has fairly clear good and evil sides, it's never really did a "Maybe these guys are good or maybe they are bad, it's different depending on your point of view." It's usually been a clear cut "Evil side" vs "Good side" with a character themselves that might change or get brought back a bit to the other side (in the case of Vader in TESB).
Initially it did, yeah. Over time it's been shown through extra material (most of which is non-canon anymore but hey, what can ya do) that there's a bit more to it than that. Force users like Luke, Revan, and Ahsoka kinda fall somewhere in the middle of the alignments because the Jedi are extremely restrictive while the Sith are power hungry and self-destructive.
It was blatantly clear that Palpatine was up to some shit but because he treated Anakin with kindness and claimed to have knowledge that could help him and Padme, Anakin was more willing to let it slide, so when the Jedi Order basically used him as a political piece by giving him the rank of master as a cover to appease Palpatine and had him spy on Palpatine for them, it was easier for him to shift the blame to them. Once he disarms Windu, there's really no going back so he retreats even further into that belief that the Jedi are corrupt in order to justify his actions, but he also planned on betraying Palpatine so in his head it would all work out in the end.
On the other end of that, the Sith have their code of conduct hard-wired to self destruct. Only allowing your way of life to be utilized by two people at any given time, one of whom is constantly attempting to kill the other, is a poor way to preserve your culture. On top of that, Palpatine's contingency plan in the event of his death was "if I can't rule the empire, no one can"
You're better off figuring things out for yourself as a force user