I have owned the Fpace with the 3 Liter Diesel and the Fpace with the 3 Liter Petrol engines and can give you an idea from them two,
The 3 litre petrol is more fun to drive and is quicker to pick up from stand still and has a exhaust note that when you plant your foot you hear, if your driving is more around town and A roads then i would choose this all day long and with the issues of Diesels being brought to light more and more it may not be an issue as yet but in a few years when you come to resell the diesel unit could be an issue.
On the Diesel plus points, if your driving is motorway then the 3 litre diesel has great mid range pickup and is a pleasure to drive, it is not as quick low down as the petrol or as fun to drive around A roads but it does a great job of eating miles with little effort, it is also a lot quieter to drive as the exhaust it almost silent and another plus is you get a lot more miles per gallon if this is important to you, you need to remember you do need to drive the diesel some distance as around town the exhaust will not get upto temperature enough to do the diesel exhaust gas burn the car needs to do every so often, it does let you know on the dash that you need to drive for the car to achieve this otherwise the area on the exhaust where the particles collect will not clear and your need another trip to the dealer, your need to also factor in your need to visit the dealer to have the Ad Blue topped up if you do a lot of miles.
So A roads and around town - Petrol all day long.
Motorways and long distance driving - Diesel all day long
Hope this may help.