Turn all energy into shards. Leave shards in vault. They can then be turned into Glimmer or Motes at your leisure depending on what you need them for at the time. I recommend this because when IB comes back you don't want to have to be scrambling to find glimmer last minute. You can just go redeem some shards. And then when Xur comes you can turn the shards into motes if you need them.