I see little to suggest ripple will make any big price movements, the price seems to fluctuate within about a 30-50% band, from $0.2 to $0.3. If you're interesting in buying it to sell off at high points and rebuy then go for it, if you're looking to hold it for the long term then I don't see any strong evidence to suggest you should
What do you think is one of the best long term?
There are many that are interesting, you can look to some of the main currencies such as litecoin or one that's been performing well lately is IOTA and has a lot of hype. A coin I like is Enjin, the games market is huge and with a market cap of only $30m it has great potential to grow.