Most of the comments here are about trust, that might be biased because it is a freetrade community. I have the account in both the platform including plus account in freetrade and both are wonderful platform the benefits are
Freetrade: You can set the limit order in fractional shares for plus account (in trading 212 you can only put limit order on full share)
Trading 212: The currency conversion rate is cheaper i.e .15% (in Freetrade it is .45,%). No extra fee for ISA account. You can also download transaction history in CSV format ( Freetrade doesn’t support this useful feature). Also they have pie auto invest feature where you can make your own etf by setting the allocation in companies.
Overall I like both the platform as you don’t have to pay extra fee on individual stock purchase compared to other traditional brokers.