Who makes the LOUDEST bell?
The deafest bell-maker?
If I'm passing peds I give them a wee ting ting (always appreciated). If I'm trying to catch the attention of a motorist (for the usual reasons) I fill my lungs up to the brim and just bellow out. That works better than any bell ever has.
When selecting the bell I went for tone. Whilst in the LBS I went through each bell until I got one that sounded just right. I'm sure they were glad to see the back of me that day.