I've used both services for a while. Here is how it turned out.
Photon - I never could get the cilent to work properly. It started up, loaded rs, and then crashed. I modified the sh file, like instructed, numerous times with no effect. And their 'all support tickets answered in 30 minutes or less' claim is a complete crock of shit. Took 2 hours for them to answer me. And the answer loaded with gramitical errors. Also, it took a little over 8 hours before they sent me access details for my vps.
Seerhost - Cheaper hosting. Nexus preinstalled. Client works perfectly with no issues. As for how many bots I can run, I easily run 3 bots and use a little less then a gig of ram. And for some reason I have 4 gb of ram even though I ordered the 1 gb package. Also, It only took them 20 minutes to answer my support ticket. Might have been luck, but still... Much faster then Photons, less then quality, support. Took a little over 30minutes before they sent me access details for my vps.
Result?
Photon is a craps shot. Sometimes you get a win, sometimes you get a loss. But the thing is why even use a general use vps when you can use a vps that is dedicated to rs botting?