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Hi There I'm honestly not sure about specific concerns with those platforms. But I can give a few general tips; In addition to redirects, be sure to maintain titles and descriptions (unless you're updating those too). Going from one platform to the next can change these all around due to default templates etc so you may want to just be sure they stay consistent. I'd  crawl the site with Screaming Frog a bunch of times right as it goes live to catch anything unforeseen: 404's etc. Monitor Webmaster Tools closely as well for errors and messages. I'll see if another associate has some Magento specific experience they can offer tips on. -Dan