I have used several of the Leupold VX3i and the Swarovski Z3 lines of 1” inch tube scopes, the Swarovski has better glass for sure if you compare 3.5-10x40 to the 3-10x42, for hunting these are excellent scopes but at the range I struggle with not enough magnification more so with the Leupold, minimum I prefer for my 56 year old eyes is 4.5-14x40, it wasn’t an issue when I was under 50….!
Pros and cons for both depending on how old your eyes are and how it applies to you,
Weight wise you’re dealing with a cpl of ounces either way so pick your poison.
The new Leupold VX3 HD ZL-CDS is a much better turret system than the Swarovski,
If you go Swarovski and want a reticle like the BRX/BRH and no turret get the BRH(H=Heavy) the BRX is to light of crosshairs and you lose them in 1st and last light, I know as I’ve owned both.
If you just want a lightweight 1” scope and no turret, the Swarovski is a better option, if you want an MOA dial up scope go Leupold
The next step up in power in the 1” tube scopes Leupold 4.5-14x40 compared to the Swarovski 4-12x50, same thing again Swarovski better glass Leupold better turret but now your into a 50mm objective on the Swarovski which I find to big for a lightweight hunting rifle application,
For me the new Leupold VX3 HD 4.5-14x40 ZL-CDS 30mm tube scope is the best compromise for a lightweight (15.5oz) Hunting/Long Range shooting scope made, if I step up in weight class after that I prefer the Zeiss V4 4-16x44.