Do whatever suits you best on each and any trip.
Do you value / need a bag on the jaunt? If so, use one. If no, use a top box (or not) as (and if) required. Only you will know what you are planning to do, what you might need and /or how or what you intend to carry.
In short, there is no perfect answer, just as there are no perfect answers to: what are the best panniers, helmet, tank bag, tyres, communications system?One man's meat, is another man's poison, after all.
Do you value / need a bag on the jaunt? If so, use one. If no, use a top box (or not) as (and if) required. Only you will know what you are planning to do, what you might need and /or how or what you intend to carry.
In short, there is no perfect answer, just as there are no perfect answers to: what are the best panniers, helmet, tank bag, tyres, communications system?One man's meat, is another man's poison, after all.
