Neither one. An off center side mounted scope is an ugly & difficult to use set up.
If I wanted to scope a top ejecting lever action I would seriously consider some type of custom quarter rib that is attached to both the bbl & receiver ring and mounts a scout type long eye relief scope ahead of the receiver & on the centerline.
I saw a Winchester 71 .348 WCF set up this way & it looked & handled very well & it had the advantage of quick detachable scope mounts so you could easily go to the iron sights.
