Which is the best overnight diaper and why?

My daughter is 18 pounds and 9 months. She wears a size 3 diaper, but can wear a size 4. She typically wakes up twice at night to nurse. I put her in a Pamper's swaddlers overnight diaper at 8pm, and I change her at midnight because she's pretty wet. I change her again at around 4-5am (but I put her in a day diaper because she's going to be awake at around 7am). I can't get more than about 4-5 hours out of an overnight diaper!

My question is this...

Is it worth it to size up in the Pamper's overnights? She's in size 3, but would size 4 be better?

Should I switch to Huggies overnights? Should I do a size 4?

Is there a better brand of overnight diapers?

I'm down to my last few overnight diapers and I'm not sure what I'm going to try next.