A ".com" is a much better long term solution because Google and people generally recognize that as more authoritative/ trustworthy. The best way to change a ".co" over to a ".com", is by creating a "301 redirect" for EACH PAGE and keep everything else the exact same until Google indexes the new version. Also, you might want to contact any important inbound links and ask them to update their link to be to the new address. And you can register both domains inside Google Search Console and submit a "change of address".
Does this help?