top floor or penthouse?

top floor always facing problems with leaking from roof slab

Only if the lift got problem..

If really high, all lift have issues or malfunction, prepare for free fall of your property price

Leaking.
Depend on design; u may hv water tank sound or lift vibration sound. It can get loud at night...

Yes it is, try imagine going up and down the stairs for 25 floors for just 1 day assuming lift not working

u have to wait for the elevator.

Another point is, top floor usually warmer compared to other floor...

Talking about leaking its not as simple as you think... when leaks happen, its not something that u can just simply pay to fix it, it require the community/management to take action on these which takes time depending on the community's efficiency because the area that leaks may not belong to your ownership

usually 6 months after vp can notice the leaking

one more thing if all door and window not fit properly, you will face a whistling sound from the wind especially during heavy rain

how many units for penthouse per floor?

it will be nice if only your house on that floor

Dont bro, one day u kancheong wan pee, but have to wait for the elevator. Can die.
I'm only staying at the 8th floor

how about 25th floor?

Pro : Nice view

Cons :
1. after few years already got used to that view
2. Still noisy despite of higher floor, the sounds from the street / motorcycles are amplified
3. Annoying elevator stops inbetween floors especially during morning and evening (before and after working hours)
4. Inhaling body odours of other tenant in the lift.
5. Nowadays condos do not have rubbish chute, you and other tenants have to bring down that smelly garbage inside the lift all the way down. Some idiot spill the wet fishy stinky sotong garbage all over the lift.
6. More..