It may depend on how the digital magazine is delivered.
I like Quilter's World because it is in pdf format, which is easy to save on my hard drive. (Plus they gave me access to something like 12 years of back issues with my subscriptions, all of which I was able to save to my hard drive. This means I have permanent access to the back issues even if I do not renew my subscription.)
Some of the other quilting magazines I checked out had unique systems for digital delivery, which became very confusing. I just don't need more confusion in my life!
Also, some magazines are delivered via Zinio:
http://www.zinio.com/whatsnew/ which, as far as I can figure out, is an online reader. I'm not sure if you can print from all of these different delivery systems. I believe with most of them you cannot save the magazine to your hard drive. This always makes me wonder if I will lose access eventually -- for example, if they change delivery methods and I don't keep up with their changes.