If portability is a problem for you, consider your choices carefully and go individually by the models of both of those. In general, you will likely finish up with a scooter, as most scooters are foldable, and most bikes aren’t. Many cheap electric scooters will come with eight-inch wheels. https://www.electricscooter.ltd/20000w-84v-cheap-electric-scooters-with-hydraulic-brakes-k20/