I would bet on both, I invest 50% of the money which I want to invest in BitCoin, then remaining 30% on Ethereum, rest 20% I divide in AltCoins, AltCoins are way cheaper then BTC and ETH, so in 20% of the money, I am able to accumulate a basket of AltCoins.
Now the question is which AltCoin to buy, in the current scenario, lot of myths exists in the industry around various coins. I personally prefer to read upto some extent about the team and what does the coin do, one simple fundamental I follow is to read about the team working behind the coin's development, more than anyone else, it is the team which matters the most.
I think Vitalik and the team should be given a lot of credit to the state of ETH today.
AltCoins that I have picked up are -
1.Tron, and EOS, reason both are having lot of dApps, built around them today. At least some promise exists where gmaing and gambling industry are using crypto.
2.Then I have invested in some of the coins which I personally think would grow big because of the fundamental of the coin, BAT i.e Basic Attention Token, 0X, Maker and SiaCoin.
You can and you should do your own analysis before you start to invest.
Exchanges and wallet which I use -
Hacks hacks and so many hacks have happened in the recent pasts , Everyone Should understand the risk associated with investing - The same way you’d understand the risks associated with building a house, before you go build it. Or if you’re going to transport 1 tonne of Gold, you wouldn't do that in a wheelbarrow for everyone to see — you’d do it an armored truck, with 4 guards. The same way you don’t go to the bank, withdraw a bunch of cash and walk down the street waving it around.
Wallets - Ledger nano s for long term storage of coins, multi currency wallets like Gaurda to store coins for trading,.
Exchanges -
CoinSwitch Exchange for trading, they have the maximum no. of AltCoins with them.