I have two Gransfors and one Wetterlings and seen several of both with other people.
As far as the quality of the handle goes, G has a better finish but the grain is far from being vertical on all axes and occassionally there is some heartwood, too.
With the Wetterlings, you have to sand off the varnish of the handle. Then you can, as with the Gransfors, start to improve its finish (moisten the wood, hair-dryer it, sand off the splinters, repeat several times, rub Ballistol or similar stuff in)
The fitting of the head is somewhat sloppy on my Wetterlings, with a large (3x8mm) gap on top of the handle.
The sheats are very simple, rivetted together, with the wetterlings not even having a welt.
If I could get a Gransfors in selected (!) pieces, I would very much prefer to hang one myself.
As a first axe, I would recommend to get the Gransfors "Small Forest axe" or the Wetterlings "Large Hunting axe". They both make a god starting-point to gain experience with.