That is your choice.
Absolute and Absolute updates/upgrades have been included in more sales in recent years than the individual instruments.
The advantage of Absolute is that one licence covers the full versions of HALion, Groove Agent, Backbone, The Grand, Retrologue and Padshop. You can crossgrade an individual licence for the current version of any one of those instruments (other than The Grand) to Absolute in return for a discount, then sell any other licences you own for the included instruments. You can choose whether to install the add-on content bundled into Absolute or ignore it.
The disadvantage of Absolute is that you must pay to update Absolute in the future; you cannot update individual instruments included in Absolute.