So test it both ways and see how YOUR target users respond to YOUR ads.
So test it both ways and see how YOUR target users respond to YOUR ads.
This is really excellent advice, I think - for this and and a great many other similar questions that might be asked along the same lines.
I can't remember if this is in the recent active 'best tips' thread - but it should be. ;)
Test. Learn. Adjust. Test. Learn. Adjust. Have a frosty beverage of your choice. Test...
AWA
Querying my client database, across many verticals, both search and content, poor client ads and mine (clients tend to use the www.), I get these CTR figures:
With: 0.78%
Without: 0.86%
So that's a difference of 9% more without. This data is over 5 million clicks. But I've noticed that in some niches, the reverse can be true. So, to repeat others, test and find out.
Now here's the strange part. On the content network, the CTR is higher WITH the www. by 53% (0.32% to 0.49%).
I also have a flag on many ads which tells me if I or the client created the ad. Client ads do better for some reason with the www by about 10% while mine do better without by about 21%. So go figure.