The price movements look bigger because there is less liquidity in BTC-EUR than BTC-USD. Meaning a 50BTC market buy in BTCUSD may move price $0.20 whereas in BTCEUR it might move it $1.50 simply because the books are thinner.

This does not mean you can make more money in BTC-EUR because although volatility may appear to be higher you still need to get your orders filled at the right prices and that is much harder in BTC-EUR than BTC-USD especially during times the market moves rapidly which is when the profit potential is highest.

In fact I am sure most of those moves you see in BTC-EUR are arbitrage bots on EURUSD and BTC-USD.