OKRs are well-known. According to Google there are 18 million pages contain this term. Objectives and key results (OKR) is a goal-setting framework for defining and tracking objectives and their outcomes. Book: Measure What Matters
WOOP is less well-known. According to Google there are 6 million pages. WOOP (Wish, Outcome, Obstacle, Plan) is a science-based mental strategy that people can use to find and fulfill their wishes, set preferences, and change their habits. Book: Rethinking Positive Thinking
OKRs: OKRs are mostly used in a company context. Only few people use OKRs for their personal goals
WOOP: WOOP is used mostly for personal goals/wishes. AFAIK it does not get used in a company context often.
OKRs: Objectives and Key-Results
WOOP: Wish, Outcome, Obstacle, Plan
OKRs is about "goals". WOOP is about "wishes".
It depends on you. For some there is a difference, for some not.
For me there is only a little difference between both terms.
OKRs focus on measurable key-results.
WOOP calls it outcome. In the book Rethinking Postive Thinking are several examples for measurable outcomes.
Again. Both methods are quite equal here.
OKRs have two parts. The objective and the key-results.
WOOP has something called obstacle. That's where active negative thinking is started: What could go wrong?
I like this part. It is called mental contrasting. First you "paint" your dream/wish. But in this step you actively check for obstacles which could stop you from achieving your goal.
That's why I like WOOP. First you dream, then you do the reality check.
After you listed the obstacles, you create plans. What could you do if these obstacles will raise?
It is good to have a plan. I love it.
My personal, biased perspective: I prefer WOOP.
More of my thoughts at Thomas Working-out-loud