IMO, it's *always* been best for the UK to go for a hard Brexit. Our European offices are based in the UK and that's what we've been planning for. So much so that the data center we built out in Luxembourg is getting minimalized and our systems are staying in the U.K.
If the majority of your business is in the UK, it doesn’t make sense to keep data in the EU - post Brexit, there is a chance the UK would drop GDPR rules.