If you're going to keep the sections self-contained, solid glass is the best option. But you kinda have to be fairly sure of your plan since re-doing it somewhere down the line would be a big pain.
There is a small disadvantage to self-contained sections - you basically end up with 4 smaller tanks that just happen to be stuck to each other and would have to treat the tanks as such: be more aware of potential water quality issues since you won't have as much leeway as with bigger systems. Many many people keep their shrimp in fairly tiny stand-alone tanks with few issues, so it's not a huge deal if you're keeping an eye on it.