[Deman77]

The D5 is very agricultural and gearbox is not a good match. Also IMOP the turbo is too large (should have been a twin scroll or a bi) and it makes it too laggy at urban speeds - though I have not tried the new electric assisted. It only makes sense if you need to tow. The racket is the opposite of luxury. If you are after saving fuel D4 is less laggy because of smaller turbo.

T5 is perfect match for the gearbox. If you can put up with lower economy (make sure to allow for fuel price difference not just mpg comparison).I tried those three in xc90, v60cc and xc60 respectively - they are not too dissimilar to make enough difference. Out of all those I would go for t5 for comfort.
Also t5 warms up way quicker in winter for heating.

I heard of t6 being a bit lumpy as well (not laggy but lumpy). Unless you found t5 underpowered don’t bother.