I would not get a chronical.
It does not offer enough advantage over a brew bucket to warrant price, and price is close enough to a unitank to not get the unitank.
Chronical is like a half way step between the two. I'd suggest to decide go light (bucket) or heavy (unitank)
Assuming if you're thinking of a keezer, that you're still bottling? I'd hands down go the route of kegging if you arent doing that already.