As others have noted, PC9 was a clear winner apart from the unfortunate part about it not coming from Brazil.
Just before the obvious winner being announced, at a secret training base in Yorkshire (the nicer one of the 3) I remember an ex-JP QFI, now working for one of the companies bidding to replace the JP, meeting up with a mate flying a JP5 over the Vale and doing a flypast and RIAB at said base. Seeing the PC9 and JP5 in close formation (JP5 leading) was quite impressive. After the PC9 had departed back to (was it?) Brough, a tannoy went round the station asking that if anyone had taken photographs of the flypast to bring their undeveloped film (remember that?) to the CI for safe keeping. Seems we were touchy about endorsing products even back then.