How much downtime have you allowed for in your business plan? What is your policy to ensure your site is running in the event of an outage? The answer is probably NONE in both cases, you are the problem, not your service provider.
The uptime figure you refer to will apply to the network not the hardware, it's a fact of life computers and servers go down, you should have a plan of what you will do when it does go down, it will happen with any provider at sometime. You can switch to your backup services until their server is back online (but you probably don't have any backup services as you probably are expecting zero failures, and your policy in the event of outage is to blame your service provider and shout as loud as possible and post such things as this about their reputation) When in fact the only problem is your false expectation of zero downtime and lack of of planning/policy in the event of outage.
YOU need to consider your policy and take responsibility for the decision YOU have made and not hold your service provider responsible for the poor decision you have made (put your site in a single shared hosting, with no backup (mirrored) service to switch to in the event of outage).