If you think that those two struts on the VO going down to the mounting point at the axle have nothing to stop them bowing out under heaver load, while the Soma one does have that pannier mounting bar which also acts as a support to tie the two struts together and so less likely to move at all.
I would expect the Soma one to be a little heavier, but noticeably?
As the cheapest I've found either with rail is about £120-130, I'd be tempted to buy the Soma, as even if I don't currently use panniers, it doesn't hurt to have the option I always think.
If you think that those two struts on the VO going down to the mounting point at the axle have nothing to stop them bowing out under heaver load, while the Soma one does have that pannier mounting bar which also acts as a support to tie the two struts together and so less likely to move at all.
I would expect the Soma one to be a little heavier, but noticeably?
As the cheapest I've found either with rail is about £120-130, I'd be tempted to buy the Soma, as even if I don't currently use panniers, it doesn't hurt to have the option I always think.