The air-superiority vehicles are easily the most powerful things in the game. They don't have any real counters and can slaughter infantry, tanks and any fliers. If you're soloing then you get by far the most kills and are most effective using them. In comparison, tanks rely on decent air support and infantry rely on everyone.
Good advice, I started on Nanoweave for my Engi but might just keep my meagre certs to upgrade the Scythe. Having so much fun with that little beast. Shot down a lone (stupid) galaxy last night, was a truly beautiful sight watching it plummet to earth and explode.