eHERMS stainless coil size

I'm building an eHERMS setup using keggles and plan on doing both 5 and 10 gallon batches. How long of 1/2" coil should I go with? 25' or 50'? I've searched the forums and see some recommendations for both. I'm leaning towards 25' since it's cheaper, would fit in the keggle easier and would work better for 5 gallon batches. I just don't want to go too short and regret it.

Maybe the better question is for those who have a 25' stainless coil. Are you happy with your setup?

I have a 25' 1/2" copper coil and it's more than enough.

i use 50' cu tubing, but that is because I also chill in the HLT..