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2 lb extinguishers are like a 2 shot derringer. 5lb ones are like a 5 shot revolver; they may help you get to a bigger gun/extinguisher in order to get out of trouble.
I patterned/installed mine to get to the next extinguisher so no matter where fire is & people are, everyone should be able to exit by grabbing one then the next one... they empty themselves faster than you think

NotRPB wrote: ↑Fri Sep 04, 2020 2:17 pm Get a Red one.
The Red ones are the most popular so they must be best.

Just kidding

I put out a fire next door in their garbage can with a 2lb and after it emptied the fire restarted and the fire dept arrived and suggested next time I try a garden hose.

So
for my house after LOTS of research, I bought two 5lb ones for bedrooms/hallways and a 10lb one for kitchen area
They're not all alike: CHECK THE RATINGS, HIGHER RATINGS ARE BETTER
Here's the info on what I got.

10lb AMEREX
Model B456
Rating 4A 80BC

5lb Buckeye
Model 5HI SA 40BC
Rating 4A 40BC

(All 3 are Red The 10lb one is almost twice as heavy as the 5lb ones. )

Get a Red one.
The Red ones are the most popular so they must be best.