All down to personal preference, as both are fine and both will do a good job.
Some people prefer a Sealant or a Wax depending on the colour of the car, as wax's can give the car a warmer, deep look, so ideal for darker colours. But sealants will still do this, just bead in a different way. Sheet more than bead.
A sealant will be quicker to apply and buff off though, things like C2V3 and Polish Angel Rapid Wax can be fully applied in around 5 minutes.