I have tried Smart Valor as there was some guarantee of quality as it is swiss exchange.
I am recommending to try the exchange as it is simple to use and has great design but it has no cell app yet so it is quite inconvenient. It is one of the most secured exchanges, never hacked, certified with licenses and regulated appropriately. There is also VALOR Prime marketplace for trading NFT which are more and more popular. There is an option to trade some unique NFT embedded to this exchange.
Moreover they have their own native token which can be used for reducing fees, staking feature (you can stake their native token and others). Their native token is listed at other exchanges what gives it value.
Overall great exchange in Europe where are not so many exchanges at all.