Generally "bias" implies that you're talking more about beliefs than an actions.

If think one thing and do another because it's easier, that's referred to as "akrasia" around here.

If you're saying you believe the easier action is better, but then believe something else after putting more thought/effort/research into it, that does fall into the bias category. I don't think that's exactly cognitive laziness, more action-laziness affecting cognition. I don't have a good name, but it's some sort of causal fallacy, where the outcome (chosen action) is determining the belief (reason for choice) rather than the reverse.