1. I've never given it much thought.
2. I don't have strong feelings either way.
3. It doesn't make any difference to me.
4. I have no opinion on the matter.
5. (very informal) Whatever.

Fact
Upper and lower case letters are named 'upper' and 'lower', because in the time when al original print had to be set in individual letters, the 'upper case' letters were stored in the case on top of the case stored smaller, 'lower case' letters      .. More >>