I've played both, and I really wish Nintendo would freshen up the MK formula with challenge modes like Sonic ASRT had. The map you could progress through with various stages was such a change from the usual Karting I've played.

In short, MK needs to change.

I don't think the characters fit very well together in ASRT. Plus I haven't heard about most of them which doesn't help.

You have different costumes for your Mii, including a Sonic costume.

You got the wrong impression. I love Mario Kart 8, I hated the fanbase behind the series. I get what you're saying and don't disagree. But I definitely love Mario Kart, but I like Sonic Transformed better. I was specifically saying that because they're challenging my experience. But they are both good. But the boat car plane like DKR won it for me mainly. stages like race of ages etc. I personally thought they ruined one of my fav MK stages N64 RR, I liked the simple yet long stage it was lol. Trust me, when MK8touched my place I played it non stop for a little but MK is limited for me because it needs friends for me to keep playing. While games like MNR, DKR, Sonic Transformed, and CTR all have things beyond grand prix and basic racing modes to keep you going

never played the game on my cellphone so i dont know how much different it is, but i own the ps3 version and i've played both games for quite a while..

About the rooster, well, i was talking about the character themselves, cuz at the end of the day, thats the very reason people choose one game over the other.

Finally someone brings this question to light! I really enjoy MK8 (even purchased DLC). In fact it's the most fun I've ever had with Mario Kart. However, Sonic ASRT does do a few things better than MK8. It definitely, in my opinion, has better tracks. They are longer, more varied and incorporate water, air and land racing. Heck, on some levels the tracks actually change everytime you pass a lap! MK8 only does land (with short spouts of gliding). In addition, Sonic ASTR has better music and sound in general and is much faster. Framerate is really dependent on platform as I have my version on PC. Also for the price, Sonic ASRT wins by a land slide since I got it for $5 on a Steam sale. Mario Kart does have better character selection but only because I enjoy Mario characters more (I am biased as most will be in this department). Honestly, Sonic ASRT is extremely under rated. I can't compare multiplayer as I play local multiplayer more on MK8 and never played multiplayer on Sonic ASRT (online or local). I have spent more time now on MK8 but only because I play it with my son but now that I have an extra controller (XBOX 360) I will play it again with my son this time on my TV! And yes, the DLC adds a lot to MK8! I love the new F-Zero stages and Animal Crossing stage. The new 200cc mode I have yet to try so I will update the whole speed judgement after I have tried it. MK8 is pretty good but if I had to choose 1, I would still choose Sonic as the better overall racing experience.

So have you tried 200cc yet?
My personal take: judging from what most people have posted , Sonic All Stars Racing Transformed is the better single player game, while Mario Kart is the better multiplayer game. Also, they're both different enough to justify buying both, unless you particularly play only single player or only multiplayer, in which case, the right one for you should be obvious. For those that have played both extensively, how accurate is my conclusion? As I stated earlier, I've only played the Wii U demo of ASRT, but I have the full game on my iPhone and I've played that a bit more. I have MK8 with all its DLC.