Is Upgrading to a 1440p Monitor Worth It for 1080p Content?

I've been hearing mixed opinions on upgrading from 1080p to 1440p monitors, especially when it comes to watching 1080p content. Some folks mention experiencing a phenomenon called 'moire blur' with 1080p on a 1440p display, while they seem to enjoy smoother experiences on 2160p. Most of the content I watch is still in 1080p, and I'm a bit worried if the upgrade will be worth it. So here's what I need help with:

1. Should I go ahead and get a 1440p monitor even if I might still watch a lot of 720p content?
2. Would it be better to save up for a 2160p monitor instead?
3. Or should I just stick with my current 1080p setup? I'm also considering going for an ultra-wide FHD (2560x1080) as a possible upgrade.