Equinix Quality : DC2 Versus DC3

I visited the colo space (1 cabinet) we obtained through an Equinix reseller. There was some confusion as initially we were going into DC2, but they put us into DC3 as that's where they had the space (they have a lot of cages in both DCs).

In the past, I had visited DC2 and it's clear the facility was purpose-built for Equinix. You can tell just by looking at it from the outside, but also inside.

Driving up to DC3 (on Chillum Place), I was first surprised to notice glass windows on the outside of the building (they have the reinforced walls inside of that I was told).

Apparently, the building was some other company's datacenter or offices, which Equinix then refitted their standard-build datacenter inside the building. They also have different man-traps (like a rotating door) compared to DC2, raised flooring (which is not used I was told), and lower ceilings.

I drove around the DC3 building, and the other half of it appears to be some other company's datacenter (based on the generators on the roof). Any idea who that is?

Is DC3 the same quality as DC2? It didn't quite "feel" like the quailty of DC2, but that's just an impression and not based on any empirical evidence. It's also a bit further out there, while DC2 and its new "siblings" (DC4/5) are all adjacent to each other (on Filigree Court).

With the reseller we are using, most of their bandwidth in DC3 cross-connects to their network equipment in DC2, and that's where they peer. That's another thing that makes me feel like DC3 is quite secondary.

Are my feelings unfounded, or should I push our reseller to find a cabinet for us in DC2?