Apologies in advance if I'm posting in the wrong place. First time poster!

I used to live in Japan and have racked up a lot of ANA mileage but I've since moved to Singapore for work and have been collecting Krisflyer mileage with a DBS Altitude credit card. When I book flights I have the option to choose which mileage program I accrue the miles towards, and I'm wondering if one is better than the other. I've redeemed many award flights with ANA before and the process has been great, with a good selection of flights. I'm just starting out with Krisflyer so am not that attached to it but it seems pretty quick to collect Krisflyer miles with my credit card.

Would anybody have any insight into the comparison? Thanks!

Cheers,
Leanne