Kimsufi only uses second hand/refurbished desktop hardware, built "in the garage" and installed in low cost datacenters. Imagine a desktop motherboard just sitting on a metal sheet in a rack : that's it.

Online.net only uses branded hardware and server hardware (except the 'SC' product range) : Xeon, ECC, Hardware RAID, ...

I'd say the price/quality ratio is better at Online.net but you just might not need that higher quality if you are running a personnal blog.

Speaking about the support, OVH has been internationnaly selling for much longer than Online.net, it's still quite 'fresh' at Online.net.

About the network, OVH's one is wider and it has a datacenter in Canada, Online.net only has datacenters in France and their network has gone international last summer with many peerings/transits (they used to rely on a French ISP before). Online.net servers are all gigabit connected. Both network are DDoS protected. OVH has a mandatory SMTP filter which has its pros and cons.

It's cheaper for a similar quality. However I've experienced great pain with online.net: if you do not fit in their box, their administrative pain can kill you. No matter how hard you try to beat it. They will slam you with garbage.

Twice (in different context) I have tried to use online.net and fallback to OVH/Kimsufi. Why ? First time unability for them to sell servers, second time unability for them to get paid.