Raleigh Motus Tour 2018 - Chain electric bike replacement
Any 9 speed chain will do, of those two, one claims anti rust, the other not. For a well maintained bike, it makes no difference (except maybe cosmetics).  

If the bike has a hub motor it makes no difference as no power is transmitted though the chain.  If the drive has a mid-drive motor, power is transmitted though the chain, but there is some debate if there is debate over if the label 'e-chain' is more than marketing. 

An elite rider can output well over 1000W vs 200-300W for a ebike, so strength of the chain to handle high load is not the issue, any bike chain can handle the power of an E-Bike motor. In terms of torque, similar argument - torque of a 100kg rider standing on cranks is 175Nm, and an elite rider can probably double that momentarily, while most eBike motors produce half of that. 

Wear is likely impacted as you ride further and mostly importantly, faster on an ebike. Chains wear out, that is a given. How much faster a 'normal' chain wears out over an ebike chain, and cost and inconvenience of replacement,  is the reason to go an ebike specific chain. 

Personally I would not pay a premium for an Ebike specific chain.