Least Sucky Backbone Provider

Good morning, I'm considering dropping Cogent completely out of my transit mix, as the number of outages and problems they have been experienced over the past year has reached an unacceptable level. It has gotten to the point that we their BGP session is shutdown for longer periods than it is on. Based on the availability of on-net fiber in my facility, I have narrowed the field to the following candidates: 1. Level 3 2. MCI/Verizon 3. AT&T I'm looking for comments from actual customers of the above providers in relation to; 1. Network reliability and performance 2. Responsiveness to outages 3. Proactive notification of network maintenance 95% of our traffic mix is US48 in nature, so International routes are not a huge decision point.