Balancing epic, long-running anime with concise classics on all-time lists

[AlexanderM]

I've been diving deep into anime over the last few years, moving from mainstream hits to acclaimed classics, and I'm now trying to compile my personal list of the best anime series of all time, which has sparked endless debate among my friends. For me, a series like "Legend of the Galactic Heroes" sits at the top for its unparalleled political depth and scale, but I know its older style and length are a barrier for many. I'm curious what criteria others use to define "best"—is it pure emotional impact, cultural influence, artistic innovation, or rewatchability? How do you weigh a perfectly executed shorter series like "Cowboy Bebop" against an epic, flawed masterpiece with a slower burn, and are there any newer series from the last five years that you believe have already earned a place in the all-time conversation?