I'd love to see us sign Wharton and/or Hackney...or any other young Englishman with plenty upside. We used to be pretty good at that. Keep them in the Champo for another full season so they keep learning the ropes, then loan them to a promoted team or a Fulham/Everton/Palace type so they get an intro to the PL without the added pressure of playing for a top 4 side from the off.
As for Frendrup - decent player, can pass, loves a tackle, but still very raw. I'd much rather we bring in one of the English lads.
Cristante is a player I've always liked. He can do it all as a MF, without being brilliant at one particular thing...very much a Jack of all trades, master of none type. Covers a lot of ground cause he's clever & has the engine, can pass, can shoot, turns up in big matches...he's like Bentancur basically. The one thing I'd worry about is, has he got the muscles for the PL. But then I thought the same of Roddy and he's handled it just fine.
If I had to pick, I'd go with one of the young Brits and Cristante, but in an ideal world we'd sign Wharton or Hackney + another English lad with more experience of the PL eg Gallagher, Eze, Olise...