New Manchester United manager Jose Mourinho poses ahead of the press conference
Tottenham Hotspur and Manchester United have both clinched impressive striker signings this summer, from opposite ends of the market.
Zlatan is the more recognisable signing, but at his age, he is a short term solution for the Red Devils on just a one-year deal.
Here is a look at the case for each to be considered the better investment...
The case for Janssen
Vincent Janssen scores for the Netherlands from the penalty spot
Janssen was wanted by Paris Saint-Germain to replace Zlatan Ibrahimovic, but chose to sign with Tottenham instead, a big coup for the North London club.
The case for him is focused around the fact that long-term, he will prove to be the better signing of the two new Premier League stars.
He has signed on a four-year contract and will likely outlast Zlatan, and has the opportunity to get better and better, currently just 22.
He has the pedigree, already Holland's first choice striker, he netted 31 goals in all competitions for AZ Alkmaar last season.
With Champions League football to play this season, he has the chance to really make a big impact in Europe and develop his reputation.
The case for Zlatan
Zlatan Ibrahimovic celebrates after scoring the second goal for PSG
Zlatan Ibrahimovic may be 34, but he scored a phenomenal 50 goals last season for Paris Saint-Germain and shows no sign of slowing down.
If he can continue that form at Manchester United, he will propel the club back into the Champions League and the title race, and make the sort of impact other big names have failed to make at Old Trafford over the past three seasons.
Zlatan's record almost speaks for itself, a league winner in Holland, Italy, Spain and France, he is motivated to add to his medal collection in England, and while like Janssen he has never played in the Premier League, he has more experience in terms of adapting.
His recent retirement from international football will also keep him fresh for United, unlike Janssen who has commitments with Holland.
The concern over his contract length is valid, and Jose Mourinho needs to be looking at a longer term option at United, but if he is a success in his first 12 months, the Red Devils will be clamouring to offer him an extension.