So, the think about investing in currencies is that for example you have 50 euros and you want to double them, so you want the price of the crypto to be doubled quickly. Investing in bitcoin and ethereum in today's price maybe is not that good idea for 30 days.
The best thing you can do is to choose something cheap that has opportunities to raise fast in the future.
So after some research in the net i found that Ardor and NXT that have much similarities will raise a lot in Q3 2017 because of the Ardor mainnet launch anytime soon.
Ardor is a blockchain-as-a-service platform that will allow people to utilize the blockchain technology of NXT through the use of child chains. Since all processing will be done on the Ardor main chain, child chain creators won’t need to worry about common issues when creating a blockchain as well as securing it with enough nodes. Child chains will be able to utilize features currently seen in NXT such as decentralized phasing, voting, and trading, as well as be able to interact with other child chains on the platform, including IGNIS, the first child chain to be launched. Also Ardor can be referred to as NXT 2.0.
Most people don't know much about Ardor yet and in combination of the features Ardor is offering that are also available with NXT (see below) you can wait the raise of the price soon.
Aliasing: Initiate transactions with easy names. All aliases will end with a period preceeding the name of the child chain.
Data Cloud: Store data securely right on the blockchain. This can be either public or private and is time stamped.
Account Control: Restrict access to an account or prohibit transactions without approval by multiple parties.
Monetary System: Create customizable monetary system tokens in addition to the child chain native token.
Secure Messaging: Send encrypted messages and files without a centralized system.
CoinShuffle: Optionally allow users to mix funds quickly and efficiently with other users’ funds to further increase privacy.
Voting: Decentralized polling for secure and anonymous voting.
Plugins: Plugins will be able to be installed to increase and customize functionality.
Phasing: Create automatic conditional or unconditional transactions with deferred execution.
Marketplace: Have a marketplace where anyone can buy and sell physical and digital items.
Also because Ardor is in testnet phase, when it will be launched NTX holders will get 0.5 IGNIS coins for free.
So, you have profit from Ardor, from NTX and waiting for future profit in IGNIS.
Also, another good invest that is raising too and started as clone of NTX is NEM (New Economy Movement). Even the client looked like the NXT client. But it was soon rewritten so it became its own legit Cryptocurrency.
Now that prices are little down is the right time to invest in that four three coins and wait for profit to come!
I hope that info will help you to choose the write coin to invest and make some profit soon!