I think it's best if you can do both trading and signature campaigns. Signature campaign is not as time consuming as trading, hence you'll have enough time to do both. Working with signature campaign, you need to have a combination of patience (it takes while to finish) and luck in getting high value tokens.Trading is risky, with high returns, though. and you need skills for that as well.
If we have a lot of time or can manage to do both. I can say we can earn a lot by doing both. As you said patience is the key because when trading aside from monitoring the market and reading some news about your investment. It'a too risky too while signature campaigns or other campaigns we only need to be patience and hard working because some task required reporting.