When it comes to e-bike suspension, a monoshock could be a better choice compared a twin shock. Details explained as follows.
Good at hauling load but doesn't help with bike handling
Twin-shock absorbers feature two valves and two pistons and do well in hauling load. Tuned to be softly sprung, they generally allow a more supple ride. When it comes to cost efficiency, as a twin shock system is easier to manufacture, they are generally cheaper.
The cons: since the two shocks work independently, it is virtually impossible to match their cadence. This will inevitably affect bike handling and decrease overall riding stability.
Nice handling, great stability, but more complexity
A single shock uses a single valve. As you have probably guessed, bikes with monoshocks handle better than those with a twin-shock setup. As for damping, monoshocks absorb bumps in a more precise way, leading to better handling and stability.
The downside is that monoshocks are more expensive to manufacture and harder to maintain due to a higher level of complexity. Also they are not designed to handle excessive load.