Waterfall and spiral model failed in the general case for the reason of plan everything in advance, so unless it's a safety critical system I'd say Agile is sti

Waterfall and spiral model failed in the general case for the reason of plan everything in advance, so unless it's a safety critical system I'd say Agile is still better. I say this because no matter what methodology is used there will be spaghetti code regardless, mid tier devs like to over engineer solutions, junior devs don't know better and do whatever is first on stackoverflow. Business execs also don't ever know what they want so change a system half way through when they see prototypes so then you still end up with Franken-systems. To that end, you might as well start with a half spec'd system as it saves time.