Oh! Another similar topic    But well your one seems to looking for personal advice.
With amount like 10 BTC entering directly into trading is not good. If you go in directly without experience, you will find no difference between trading and gambling 
I suggest you learning little before owning large stock of coins. Best is if you buy wide range of altcoins like 15-20 in smaller quantity budgeting 0.5 BTC for pre-pilot survey. Later on, you could easily ascertain which coin giving you good return and which isn't.

PS: Investment in Bitcoin is 99% scam and there are very less legit options available. Trading is far better than investment in case of bitcoin.

I'd start out small; 10BTC is still a lot of money, and percentage wise it doesn't matter if you trade with 10 or 1 BTC. As soon as you get good results with 1 BTC you could trade with more BTC.

Welcome on board, Instead of suggesting you any single option, I would try to give you a short idea of both the options. Trust me, both the options are far better than gambling.

Trading is something that making profits from the short term movements of the price chart. You can take the marginal advantage with the features like  leverage in trading which enables you to create a position of higher amount without actually investing that much amount. You can multiply your returns (profits or loss) with that feature.

Investing is something that you buy some coins and forget about it for the minimum period of a year, two or more. It is intended to earn profits in the long term. People who bought bitcoins in 2010/2011 got multi fold profits on their investments.