I've laid some of the waterproof vinyl interlocking floors in other areas...including on the bottom of some DIY plywood tanks, after sealing with epoxy, because it acts a tough cushion to protect the bottom from dropped stones or scrapes from sharp objects. I have resisted using it on the concrete floor of my basement fish room only because I am concerned that water seeping underneath...which will happen...might be trapped for long enough to foster the growth of mold.
The tiles snap together, are easy to install, last forever, look great...but they are only made of waterproof material; they don't create waterproof seals when they interlock. Even if you lay a solid sheet of some similar material, I can't help but think that water would find its way underneath and stay there.
An epoxy floor would IMHO be far superior. The ones I've looked at are not significantly more costly than the high-quality vinyl tiles. More prep work, but overall probably less install time...and really, it's a one-time task either way. Who cares if one or the other is a bit more or less work, or costs a bit more or less? It's amortized over many years so these differences become almost insignificant.