I've been on the Minimed for 3 years. Never tried the Ping, the Minimed is the only one I've tried. I like it! Never had any issues with the pump itself really... when I started they told me to sit down when inserting, and I got several No Deliveries, then found out that I should be standing when inserting the site. Also I did return the first pump, because I used the clip (not the holster, the slimmer, less bulky one), and putting that on and off made a crack right around the battery cap. Dont think it would have been a problem, but I called and they said "return it just to be safe" and I got a new one in the mail and sent back the old one.
I use the Bolus Wizard all the time. Not sure if the Ping has a similar tool.
One thing I wish was included in the Wizard was putting in your carb ratio. You preset your ratios in the Bolus Wizard Settings, ex. 12a- 8a 1:15, and so on. However sometimes I don't use the ratio I've programmed in, and it doesn't ask for that every time in the Wizard, it just uses your BG and Carbs and calculates based on the preset ratio setting. So I've gotten good at division in my head :)
Also wish the Minimed had a general alarm setting on it. Like, a wake-up alarm. When I'm somewhere I don't have an alarm clock and want to get up in the night to test, it would be helpful to be able to set one on the pump. But I don't know if any pumps have that, just something I wish I had.
So glad I started the pump 3 years ago (dxd 4.5 years ago), it has made life a lot easier. Good luck!