OP, given no bike type is mentioned, ILL say.. :

the Big single front bag, like on my Brompton ,
on its own Quick remove rack & frame clip,+ a shoulder strap,
is easier to cope with off the bike,

than the pair of panniers I use on my Bike Friday's front pannier rack.
though the pair of front bags (Older Ortlieb Sport packers)
do have welcome additional volume ..
I improved on their performance, somewhat, by strapping them together ,
and interweaving the webbing handles ..

one thing I find a peeve with Ortlieb is they make loose bags.
and off the bike are always the several individual loose bags,
you have to deal with.
rather than strapping or snapping together as pairs,
to only have 1 handle between them..