Honestly from the comments here you can tell who frequently travels KLIA/Changi and who doesn't.

Whenever I land in Changi, the moment I leave the plane, it takes me less than 10 minutes to leave the airport and sit my taxi. If I have check-in luggage, can add additional 10-15 minutes, which is pretty quick regardless.

Meanwhile in KLIA1/2, fucking shit takes FOREVER especially luggage. Grab pickup is a shitshow especially in KLIA T2. It will take minimum 1 hour (very lucky already if 1 hour) to leave if you have checked luggages, not to mention the endless walking in T2. With T1, some more need to take train (bus now) if you're arriving internationally. Heck, even departure also need to take train/bus.

In comparison, Changi, all I need is literally put my Grab to either T1/T2/T3/T4, pass immigration and fly (or arrive and leave). Where got this train/bus bullshit. Usually you only take Changi train to switch terminals if you transit only.

KLIA is poorly planned and it shows. Don't know why people keep defending it.

And all of these, I still haven't factor in the fact KLIA is freaking 50-60km away from city centre. I can land in Changi at 7am and be at my hotel by 8am. If I land in KLIA at 7am, inshallah 10am only I will be at my hotel, and proceed to pass out because of how tiring it is. The difference is extremely obvious it's not even comparable.

Changi didn't win best airport in the world multiple times (or at worst Top 3) by luck. There's a reason why Changi is ranked 1st/2nd and why KLIA is ranked 65th.