Bands (Keltner for exmple) - important

Hi,
i have two important questions -

1. which parameters are you using for bands (keltner for example) ?
because i read in Elder's (very good) book that he recommend that 95% of the prices will be INSIDE the band,
and the default values and other versions i saw doesn't do that at all.

2. suppose i have two bands,
one with ATR = 2, with moving average of 20
the second with ATR =1, with moving average of 12

which one is better, WHY ?
(suppose both have the same prices inside)

Thanks,
Shay

I prefer using a 21 period over a 12 but i think it depends on the pair your trading. GBP/JPY has the largest range so applying a 21 really shows the swings. What application are you using that displays your Keltner ATR?

i am using MT4 and i got a keltner indicator.
it shows me the upper&lower bands,
according to the parameters like : ATR K%, ATR period, MA Period.

Shay