As with others, I started with GT, then GT2. I switched over to PC racing for a while (Papyrus NASCAR titles) and got hooked on racing with a wheel. In fact, I think I still have my Logitech MOMO wheel in storage. I played a little FM2 and PGR 3 & 4 while I was using my xbox 360 primarily for Halo and Call of Duty. When FM3 came out, I ended up getting that and a Microsoft wheel. I stuck with it for a while, playing intermittently offline only. In November 2010 I started my online FM3 career and was hooked! I eventually upgraded to a Fanatec GT2 and Clubsport pedals. When FM4 launched, I was running all sim settings. I joined a few racing leagues and started setting up and managing racing series on a few different sites, as well as working with a couple of design groups creating custom one-offs and race replica liveries. Eventually, my hobby started feeling more like work, so I stepped away from online racing for almost a year.
Somewhere in the middle of all of this, I picked up a PS3 and GT5 and tinkered with it a few times, but never really put in the effort required to make the transition. I went back to FM4 even though through various updates Microsoft had managed to make my Fanatec nearly unusable. I got involved with another racing site and have been developing and managing racing series for them since the spring of 2013.
I was all set to pick up an XBONE and FM5, then details started coming out. Couple my disappointment with the little bit of news being released before the launch of FM5 with a more unstable financial situation, I cancelled my preorder of both console and game. Post launch, I am happy I did. By eliminating livery/vinyl group sharing, eliminating staple tracks, and removing car clubs, Microsoft has seen fit to practically dismantle the online racing community, focusing almost entirely instead on casual gamers.
Since I had an unused PSN gift card lying around, I decided to pick up GT6 when it launched. Starting from the bottom and working my way through the career (using all sim settings with the wheel as I did with FM4), I have begun to appreciate GT more than I had in the past. That being said, I still find FM4 to be a better racing game, while I find GT6 to be a better driving simulator. To clarify, a major part of running an online racing series is to create an immersive racing experience. This means custom liveries, number boards, sponsor decals, etc. Each driver makes (or works with a designer to make) the car their own. The lack of a livery editor is the primary reason why the site I currently race on is not considering GT6 as a viable next step in the growth and development of our community. The loss of features, the lack of tracks and cars, and the entry level price point when considering the cost of a new console of FM5 is similarly removing that title from the equation as well. In the meantime, all of our racing series are going to remain on FM4. Further, as of right now, several series currently being considered (Tudor United SportsCar Challenge, Vintage LeMans Series, Lamborghini Super Trofeo, etc.) are all being developed for FM4.
There is truly enough content to extend the life cycle of FM4 until there is a reduced price version of the XBONE (sans Kinect), a livery editor is added to the GT series (maybe in 7?), and/or Turn 10 sees the error of their ways and brings back livery and design sharing as well as the cars and tracks that were cut (likely in a series of ridiculously priced expansion packs). But for now, I am enjoying continuing my online racing 'career' with FM4 and GT6 serves as my escape when I just want to drive.