my history:

bought ps4 at launch. played a lot. enjoyed it.

had to sell for some reason in 2016. replaced it by xbox1. played all the exclusives etc. enjoyed it also for lot of time.

then gave up gaming till april 2018. when i finally bought ps4 pro with god of war etc.

enjoyed it . caught up with gaming as you know 2 years had a lot of gaming.

3 weeks ago i felt a void in my gaming life. as i love gaming and i keep seeing and reading anything gaming related.

i missed the xbox exclusives. there is no doubt about it. xbox is far behind in terms of quantity. but in quality it is as good as ps4 if not better.

i bought xbox one x again and im enjoying gears 1234J for the millionth time and dont regret it. and not to mention . any multi platform game i can buy it on x1x as it will be better. (tomb raider , oddyysey, rdr2 )

my point here = you should own both if you can afford.

i havent played forza 4 yet . but i have played forza horizon 2 back in the xbox one in 2016 . and loved it and cant wait to get to fh3 and fh4.

xbox one x truly shines in exclusives's quality , replyabality. not to mention the backward compatiblity for nostalgia.