You have the option of not only racing solo or online but as part of racing club or community if you desire. (cogconnected.com)
The difference is that you only have 10 cars and you can only race in one country (which gives you access to 5 tracks with 11 distinct variants). (playstationlifestyle.net)
Trials HD isn't only a race against time, but against game physics. (kotaku.com)