DAN is by far the best for me.
However I am in the process of creating my own landing pages because I want more control over the entire process (no more anonymity, choosing which escrow to use or not, custom TXT DNS records for verification on other platforms, SEO benefits, and more)
Flip would be great to use as landing page if it did some things similar to DAN:
• buyers could place offers without the need to create an account
• easier bulk import and edit - I want to simply upload a list of domains, not a predefined spreadsheet
• a way to verify ownership and transfer a domain from a previous owner who listed it on Flip; I buy a lot of domains which have already been listed on flip, so when I try to list them there I get an error and the only solution is to ask the previous owner to remove it; not practical for hundreds of domains