Try both, and have a look at a Pro Till and Sumo DTS while you're at it. IMO the Zip Till is a cheaper version of the Pro Till. It will depend on what soil you're on & what you want to drill through. Not sure about the Zip Till's trash handling capability. @AF Salers had one a while ago.
I chose a Claydon Hybrid for its simplicity, though seed depth is inconsistent. The Pro Till came second but was heavier, more complicated but arguably would have been better on heavier land if I'd had a bigger tractor to pull it.
Getting seed depth is more of an issue on the wider mounted drills because of the extra depth wheels ??
It was more to do with the fixed coulters but yes, on soft ground it does put seed deeper, though that never harms yield as it's the lighter soil that establishes better anyway.
Don't think they've made Zip Tils for a while so I wouldn't bother unless you know of a used one in great order that interests you.
Forget strip till if you have really stoney land unless your gonna bin the leading leg off n put a disc on, be forever on picking stones.
The disc is great but only once your soils are sorted. The rest of us newbies need a tine in to pull through the tight layers. A good set of rolls with an operator prepared to pick the few bigger ones sorts them.
Is your land doing like what Geoff says and getting more level the more you use the drill, ours definitely is but that's just with a 3 m it's getting like a billard table
Seen one in a dealer s add .
I made a mistake and bought a 4m free flow in a sale [emoji20] done 25 ac with it . It s not for our land to many stones for it .should have gone strip till as was the original plan . But could not resist a bargain.
If you can pull it now, why would you not be able to pull it with Metcalfe legs, you could always reduce the number of points.Would it take more pulling?
As only have JD 6155 or tuned 6150 180hp