It really depends on your lifestyle and holiday plans.
1. I try to charge everything to the card as much as possible, Lazada, Shopee, hotels, restaurants, etc.
2. I have claimed 1,300,000 MR into Krisflyer already. There's another 560,000 MR sitting in my account - waiting for the next Hunger Games.
3. Priority Pass is good, but in Singapore it doesn't allow shower facilities - I use my HSBC card for that
4. I used the Centurion lounge and Delta lounges (with a valid Delta airlines ticket) in the USA and found it beneficial
5. Golf privileges as well but not easy to book, must be very flexible
6. Travel insurance - but I forgot to apply for my flight delay