There doesn't appear (or smell) to be that much of a difference between Venetian and the much-worshipped Renovateur. The latter is a bit thicker, but by and large, they both seem very similar.
For the record, I've never been convinced that Reno is a fantastic conditioner. It leaves a decent shine, and this is precisely what makes me suspect that it's not really conditioning. Conditioner should be penetrating the leather and softening it; shining agents should be leaving a hardened layer of waxy/fatty substances on top of it. It feels as though these two things aren't mutually exclusive, per se, but that getting them from a single application of one product should be. I am not an organic chemist, though, so what do I know.
DWF - Interesting that you're liking Bick4 for conditioning dress shoes. I've always been accustomed to thinking of it as a heavy-duty boot conditioner. Doesn't it contain some sort of sealant? Also, what are your thoughts on Leather Honey?
I suspect you're on the right track with regard to conditioners versus polishes.
With regard to Bick4, I wonder if we're talking about the same thing. The Bick4 I have is a very lightweight emollient--reminds me of Cornhuskers hand cream. I like it as a lubricant as well as a conditioner for those times when I want to "bone out" pipes and wrinkles in a blocked vamp. The only problem is that is soaks in relatively quickly and the lubricating qualities disappear as it does.
Leather Honey...never seen or used it.