it depends on what you want – but it is not possible to say load balancing is better than bonding.
may need to watch out for certain devices that claim to bond but actually load balance. they’re both easy to set up. bonding is the best choice for just improving upload and download bandwidth capacity. load balancing will be better for if you are using voip. failvoer still available in both technolgioeis
see mushrom and xrio ubm devices. these will do both – inexpensive out of the 2 is xrio.