Well, first, these aren’t your only options. You might decide to combine related services to create a package of tasks and charge per package. So, it really depends on how specialized and time-consuming the services are that you want to offer.
If you’re new to becoming a virtual assistant, charging by hour is likely to be the simplest way to get started. If you decide to niche down into specialty services or a specific business type, that’s when pricing by package might make more sense.