I've had my Swarovski AV 3-10x 42mm scope on my .375 Ouch & Ouch, as well as my Zeiss Conquest 3-9x 40mm, and a Leupold 2.5-8x 36mm.
Both the European scopes have a number 4 reticle, and I much prefer this for woods hunting than the Leupold Duplex (or Heavy Duplex reticle -- I own both).
The Swarovski is a tad better optically than the Zeiss Conquest, but both are way ahead of the Leupold. The Leupold is lighter of course, and has the reputation of being tougher (but the Zeiss Conquest is getting a pretty good reputation for toughness too!).
Eye relief is a bit longer on the Zeiss than the Swarovski, but the AV Swarovski's have good eye relief (unlike their 30mm scopes which do not). The Leupold and the Zeiss Conquest have about the same eye relief, with the Zeiss actually being about a cm more (I measured this with a flashlight through the objective lens and a white card at the ocular end, but can't find my notes regarding the exact figures).
All of these scopes (plus a Bausch & Lomb 6 - 24x 44mm scope that I use for working up loads and "fun shooting" at the range) have stood up to many hundreds of shots. Yes, it seems odd to have a .375 H&H with a scope that goes up to 24x, but it is a blast to dribble some honey on a white page, then back off to 100m and shoot flies with a .375 H&H and 24x scope, prone -- just to watch the local shooters (with their 6.5 x 55 Swedish Mausers) marvel how I could do this without breaking my shoulder!
If I was to do it again with Africa in mind, I'd likely go for a Zeiss Conquest 1.8 - 5.5x 38mm, the 2.5 - 8x 32mm, or the 3-9x 40mm.
The longer tube of the Zeiss (compared to Leupold or Swarovski) makes it a lot easier to mount on a "real rifle" like a .375 H&H without ugly extension rings.
I have not mentioned prices because they don't matter to me (perhaps I get paid too much?!), but the Zeiss is cheaper. I'd recommend it even if it were more though, because they have nice long eye relief, and nice long tubes to ease mounting problems.
I wish I had experience with the Swarovski Z6 line, but I do not -- yet!
John