FWIW, pretty much every "C" rating is marketing at it's finest. There are a few sites that actually test lipo's to see what their true rating is and most are around 50% of what the labeled ratings are, so take C rating with that in mind.
Personally, I've run a few various brands with 40C-65C as the rated constant output and don't notice a huge difference within the brands. The bigger the system/truck/gearing you have, the more it would be noticeable.
What I have and packs I use:
ejato,
max10 sct/rocket 3665 3100kv
- hobbystar 45C 5200mah 3S
- liperior 45C 5300mah 3S
slashpede 4x4, blx185/blx4074 2050kv
- liperior 5000mah 65C 4S
- hobbystar 50C 6200mah 4S
maxx4s v2, mamba monster x/rocket 4092 1650kv
- liperior 6200mah 40C 6S
- CNHL black series 40C 5000mah 6S
outcast 6s,
max6/rocket 4092 1650kv
- liperior 5000mah 65C 6S
- CNHL black series 5000mah 65C 6S
- liperior 6200mah 40C 6S
- CNHL black series 40C 5000mah 6S
kraton exb 6s,
max6/hw 4985 1650kv
- liperior 5000mah 65C 6S
- CNHL black series 5000mah 65C 6S
- liperior 6200mah 40C 6S
- CNHL black series 40C 5000mah 6S
e-revo 2.0,
max6/blx4074 2050kv
- hrb 5000mah 50C 3S (x2)
- liperior 5000mah 45C 3S (x2)
The weakest packs that I feel the least punch with are the hrb 5000mah 50c 3S packs. Partly due to age probably.
The packs with the most punch are the liperior 6200mah 40C 6S packs.
All of them perform fine though for me. I gear my trucks to go as fast as they can without overheating when bashing in grass, with high speed fans on the motors and esc's. The only downtime I have is when I'm switching trucks or switching packs. I don't like sitting and waiting for things to "cool", so I gear accordingly for where I run and how I drive.