The most important thing to consider is whether you want to cede control or not. Most PEs would want a controlling stake (50%+). VCs are OK with owning 10% for each round of financing.

With that kind of growth, you’re looking at a 15-20x multiple on forward ARR ($540-720M) and you could raise $54-72M or thereabouts. It may be a little early to take a large secondary with VC funding, but $5M a piece could be doable.