Charger for Raspberry Pi 3B & Pi 4

Hello,
Help in guiding me to purchase/ use a good charger for these 2 beasts.

I already have used Pi4 with its original charger, the charger has gone bad and burnt off. Thinking it was due to wild power outage during the thunderstorms. It was working 24x7.

Pi3B was used earlier and is now collecting dust. Planning to use it for a simple wireless printer and pihole in another place. Just checked and found out its original power supply is missing.

Hence I would prefer 2 separate chargers.
Pi4 - preferably with removable wire, else can samsung 25w charger be used. If not possible, I will get another original charger.
Pi3B - Can Samsung 25/15w charger work. else please suggest a suitable one.

These will be run 24x7 and it shouldn't conk off due to heat.
 
I am using an old mobile charger for my RPI4. It has the same V/A output as their official charger. Mine is also running 24/7 seeding some torrents.
 
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