I help build crowdfunding sites, do Regulation A+ offerings, and have a lot of clients listed on a variety of sites.
I have invested in the following sites: Fundrise (2 506(c) offerings and 2 of their E-REITS), RealtyMogul, Crowdstreet (506(c) offerings), Groundfloor (506(c) offerings - smaller deals). I have signed up for a bunch of other sites and haven't invested.
My favorite, by far, is Fundrise. Their platform is easy to use, I like the way they operate, they have a DRIP.
I most likely won't invest on Groundfloor again - at least not for the foreseeable future. I am bearish on the SFR market and have lost money on Groundfloor - not a lot - but I have lost money. In the effort of full disclosure - I also made money on Groundfloor.
I keep hearing what Bryan is saying about "the best are not on crowdfunding platforms." Although, I am not ready to agree with this statement, I will say that my best clients (506(c) and Regulation A+) are "doing it on their own." In other words, they are doing their own marketing campaigns, raising money on their own sites, etc.
EDIT: I went through my client list. I am going to say it is truly 50/50. We have some heavy hitters that use CF platforms just for the marketing aspect of it - even if they are doing fine on their own with raising capital.
So, I think the best advice I can give is as follows: read the docs and know what to look for. Also, know what you want to invest in. I have learned, very recently to CALM DOWN. Someone in my position, I see a lot of "great deals" so it is very easy to get distracted by one type of asset class over another. I recently received some great advice from one of my clients, Scott Meyers: focus. This doesn't mean that the focus can't change, just that you should very much focus on one asset class at a time. So, how does one diversify? The market will tell you that and when to buy what.