I have no idea. We more or less took one look at all the crazy sh*t they were doing with pixels, trackers, inbound marketing, outbound marketing, SEO, sitemaps, special codes for FB, GA, dynamic landing pages...
You know it's all trivial garbage...except if you want to replace it you need to support it, train them to use these tools and at every point you're going to encounter this resistance about WHY you're doing it and you say well security and speed and they're like it's fast enough and we've never been hacked.
So until the site grinds to a halt and they get also get hacked they basically view you as a blocker.
Is there significant overlap in their functionality?