Many of the CRD municipalities have a land lift, they are called Community Amenity Contributions... some are specific policies, others are ad-hoc negotiations. From all the research carried out by varying groups, it was determined that developers prefer consistent application of amenity contributions, hence the land lift approach.
My apologies for simplifying the process for the sake of discussion.
I'm not sure if more developers prefer the land lift approach over the Community Amenity Contribution, but I think, when looking at both, they are interesting to compare.
Community Amenity Contributions, in some cases, can go above and beyond what a land lift approach would receive as it truly shows the demand from the developer and how much risk they are wiling to undertake. An example of this is the art gallery that was to-be built by Westbank at the Crystalview site. Or, for a more pronounced example, look at Westbank/Ivanhoe Cambridge Oakridge where $147 million in CAC's was given and that will make up a new civic centre, 9 acres of parks water park, 290 units of "social" housing, daycare, library branch, seniors centre etc. - article here. However, CAC's often give City Hall and developers a "bad rep" as they are seen to be buying out City Hall to get developments through. As well, City Hall is seen to be extorting developers as they are seen to be creating a "whoever pays the most, gets to build" approach.
The Bonus Density Program, often referred to as the land lift approach has been popular in large metropolitan and is slowly being enacted into Victoria. The benefits are, as Urbanistco mention, developers can properly prepare and analyze returns, risk etc. as it is a standard system. As well, the contributions of the funds are known. For instance, it is isn't a case by case basis, like the CACs, where City Hall will hope for a new social housing project, heritage restoration, a piece of public art etc. Rather, it is outlined in the plan, exactly where the funds are going.
That being said, I would argue that in Victoria the Bonus Density Program is unviable as the demand isn't there. Sure, if you are able to sell out a condominium development in under a month, like in other markets, in may be viable, but taking out at 25 million dollar loan and to have to spend the money and time of over a year to sell out, the City taking 75% of your profits is a large disincentive and will push development away from the "core" where this tax is applicable.
The goal of both programs is to get the largest return of the people, as a whole. I would argue that the Bonus Density Program will push some developers away as it will be seen as too risky and they'd rather have a CAC, so they can evaluate the risk and what they can give themselves. As well, I would argue, that the CAC program allows the funds created to actually get to the source much quicker and more efficiently. If you think about it, the Bonus Density Program, City Hall needs to hire a third party appraiser, and then once it goes into the pools of money, it then needs to be distributed. I find a simple CAC is much more creation -> source, if you will, and takes down the barriers and extra costs of the Bonus Density Program. At the end of the day it is all about returns for the people.
It is often hard to evaluate which will deter developers more, but what should be known is, if one does more than the other, there is an opportunity cost that needs to be taken into account. This means that not only does City Hall lose the funds from the tax, whether Bonus Density Program or CAC, but also the recurring revenue from the property taxes provided. I think the only way to get the answer to these tough questions is to not speculate ourselves, rather, to talk to developers and start a conversation as development doesn't need to be a zero sum game.