Mine is by far CoinMetro:
1. Instant crypto-to-fiat and fiat-to-crypto + debit cards. This will appeal to a lot of people
2. On top of providing an exchange with sophisticated trading platform, they will introduce new crypto investment vehicles like ETCFs (essentially crypto ETFs). I myself was looking for crypto ETFs before I got into trading, and the reason I got into trading was because I couldn't find any. I think that will appeal to a lot of traditional investors and will serve to provide liquidity to a lot of ERC-20 tokens.
3. They own forex broker FXPIG, which means they already have tons of experience in a similar industry, and also have the contacts and experience of dealing with banks and regulators.
4. All fees paid using their native token COIN (XCM), percentage of COINs collected from fees are burned, every quarter 20% of FXPIG's and CoinMetro's net profits go into a reserve to buy back COIN
5. They are proactively seeking regulation and licensing in as many countries as possible. While I'm more of a libertarian type, let's face it, in order to see mass adoption,
this community needs to get regulated.
6. On Telegram the team is incredibly responsive and open to all kinds of questions, including their CEO. There is zero amount of defensiveness and they really try to be super transparent. No bullshitting and beating around the bush. I also recommend looking up the AMA with their CEO.
There is more info in this medium article
Exchanges are good choice.
For example there is lccx.io - looks like promising exchange based in London. Well developed white paper, experienced team, located in politically stable jurisdiction.