The real question is are you doing this as a hobby or as a business? If you are doing this for "fun" and some pocket change then you can split it anyway that you can get them to agree to.
If you want to turn this into a full time business some day then the person putting in the money should always get at least 50%. If all that you guys are doing is putting in labor, in all honesty, I would take a serious look at your business model. You can buy labor pretty cheap. One of you should focus on finding deals while the other focusing on doing (or managing) the work. If you are just buying deals out of MLS you are probably not going to be able to sustain much margin on the project so trying to split everything 3 ways is not going to be worth it for anybody.
Take a good look at what your partners are bringing to the table. They should be able to provide something that you cannot, such as a ton of money or some type of expertise that you do not have. If you and your friend are doing the same work, then one of you probably does not need to be there and would be better of finding other ways to add value.
You will be much more profitable to let other people do the work and focus on running a business and not a hobby.