Trading212 compared to Robinhood
Firstly, both of these platforms are good for what they need to do. I've personally used both, and I have tested both for UK customers.
Trading212
This is my main platform of choice, I prefer it as it allows me to have cash ISAs, as well as stocks and shares ISAs, this simply means that all gains I make (interest from cash ISAs, or gains/dividends from stocks and shares) are interest free. All I had to do to get started was put £1 of my own money in, and I could get a fractional share of any company.
(These aren't my promo codes, I gain nothing from you using one of these)
"DIVEXP" or "JAMES"
Once I started investing, the interface was pretty clear how much money I've gained or lost, and dividends come though just as you'd hope for an investment platform.
The main benefit that I appreciate with Trading212 is the modern interface, it's also quite responsive so it feels well made. Another benefit that I found was the ability to deposit funds whenever I want.
A downside to Trading212 is that if you want to deposit more than £20,000 a year, you'll have to use the "Invest" or "CFD" accounts, which aren't tax free, and at least in the case of the CFD account, can be more difficult to learn. Granted, this problem isn't unique to Trading212, as the £20,000 limit is for all ISAs.
Robinhood
When I first installed Robinhood, the interface felt unusual, it seemed difficult to access things i'd thought would be easier to access. Overall, the interface is nice, but not quite as good as the Trading212 interface.
My link
A benefit I found for Robinhood over Trading212 is that for popular stocks, it will give you a rating of Buy, Hold, or Sell. This makes it pretty simple to see what analysts are saying. I also like how it gives you articles related to stocks you own. Something else that only Robinhood offers is options trading, this is a relatively complex part of trading, and it is much more risky, making it ideal for experienced traders.
Now for the downsides, the biggest being that Robinhood doesn't have an "ISA" account, so all of your gains can (and eventually will be) taxed. The next biggest downside (at least in my opinion) is that you can't deposit 24 hours a day. This means that if you decide on a Saturday that you want to deposit £100, you'll have to wait until Monday before it goes through.
Final notes
Overall, I'd go with Trading212, as the ISA accounts allow you to deposit up to £20,000 per tax year, and get untaxed gains on those funds. If you're more into options trading, maybe consider Robinhood. Feel free to leave a comment below if you have any questions, or want to give any feedback.