For 1btc, I think better to Gamble or to Invest...
find some tipsters here and follow them for some profit 1st...
for me, if i have 1 btc, i will use it to trading rather than gamble or invest, because i want to make more bitcoin with trading and i think for now, there is much of altcoins will gets pump. beside that, i am not good to play gambling and i don't know where to invest beside to lend on market exchange.
If you are going to enter in the lending market I would advise that you are very careful there are a lot of scammers there trying to get your coin, so thread carefully.
I guess lending will not covered under neither trading nor gambling. Moreover lending must be a way of gambling as it has more potential risks. Lending without the proper collateral might result in pure gambling.
lending for me is like investment in future, you should try it. for example, i lending for 0.01 btc in poloniex, i don't care about rate of percentage, i split it into 0.005 and 0.005 and i choose the rate that its on lending rate so my 0.005 is in the top and its not take too long to get my loans active and don't forget to set your days in 2, 5, 7, or 10 days.
from there i don't take too serious about the result, its work alone while i am trading on market exchange. so if my lending has just ended in 2 days for example, it will renew for itself so i don't worried about to set up like beginning. so far, i can collect until 0.01 btc, but i am forget when i am start.
so i think for me its give me a good profit, and my lending has get paid from trader