Always a fan of trying a new place, and 2 days is the perfect time, if you don’t like it you’re not stuck there for a week. If nothing else the stress of traffic in Bali getting to and from places would make it a no-go for me if it were just two days. You’ll be in the air for about 4 more hours total vs. Langkawi, and this is coming from someone who has gone to Bali annually for the past 15 years.