Whether there are better list managers than Wunderlist isn't a "lame" question but it's impossible to give a definitive answer. To an extent, it depends on personal preferences. What floats my boat might sink yours, and vice versa.
For instance,
@Longstreet loves Nirvana and
@TesTeq is a big Nozbe fan, and both promote their preferences at every opportunity. Personally, neither software option really bangs a gong for me. So, clearly I'm wrong or
@TesTeq and
@Longstreet are, and either they or I must quit GTD and walk away from this forum for good. Or perhaps the only way to settle this is a good mud wrestling match.
Obviously, that's absurd (well, at least I hope it's obvious to everyone, but you never know). It's possible for all three of us to have different preferences when it comes to software and still be successful GTD'ers (and even coexist without the need for a mud wrestling match).
A few years ago I resolved to stop obsessing about tools and to focus instead on getting good at the behaviors and habits that make up GTD. In the past few weeks in particular this effort has really paid off in a way that no software features ever could have (I'm actually going to start a separate thread about a couple of insights I've gained along the way). I've learned that I don't need "the best" list manager (if such a thing could even be defined objectively), just one that's good enough for me.
If you like Wunderlist, though, there's a tool that I've played with called TickTick that is actually very Wunderlist-like. And AFAIK it's not reaching end-of-life anytime soon. I actually don't use it, though (when I say I've only toyed with it, I mean it), so I can't endorse it.