I'll adress some of what has been said.
spacing is less of an issue in tekken than SC
Compete bullshit. Tekken revolves around spacing, Soul Calibur around mixup
juggles are the goal of tekken
True, but not exactly the juggles, but ability to set up big damage.
SC is more masher friendly
I dont know about mashers. But what is true - Learning curve in Tekken is much, much higher than in SC.
it is not advisable to mash the input in anticipation of a grab,
It is advicable not to mash. Welcome to competetive gaming.
lows in tekken are mostly launch punishable
true, there is low parry that makes even chip-damage lows punishable with a launch. But this issue is a matter of game mechanics - tekken doesnt rely on basic mixup (Yomi lvl1).
FC recovery in tekken is quite limited compared to SC
You have all the same options both in T and SC, . However it is generally not good to duck in tekken unless in fuzzy guarding (some people fuzzy low parry etc). which happens a lot. Spacing in general is preferrable over ducking.
8 way run system is no where to be found in tekken, where movement essentially boils down to dashes
Movement system is far more advanced in tekken. However tekken has its own 8wr (which is sidewalk and that has sidewalk-only moves) it is just not very usable, just as it is not very usable in SC.
Soul Cal gives you more options. But if you like memorizing and repeating Block Strings and Combos (ala MvC2, SF4, etc) Play Tekken.
Common delusion. Tekken has a lot more usable options, and infinitely more if your opponent is unfamiliar with something on your move set.
Tekken equals better competitive fighting game hands down
Definitely if your goal is to spend 10 years to even get any good at this (and you're not guaranteed to, as well)
Personally I've been playing both games at high level, and I hate tekken.
There is just too much to learn and too dissapointing in the process. You dont want to play the game for 5 years and still have characters you dont know? I can tell in Tekken I've been playing vs Steve for this 5 years almost everyday. And in the end I admit I'm still not perfect vs steve, there is still a lot to improve. And I dont play every character on daily basis, no. (and there are like, 40 characters and they add up)
If you dont have a huge community dont even get started on tekken. If you want to have fun - dont even get started on tekken.
The thing is, most people keep playing tekken just practicing juggles hoping for a random hit and call that fun. I dont know whats fun in it. In fact I cant even see whats fun about tekken at all.
In SC you can get good fairly fast but the game is deep enough. Basic mindgames in general are very fun and challenging. In SC if you read your opponent you can always counter it and deal damage without having 4-5 things that you can fail exectution on in the process. (yes in tekken you can know exactly whats going on but unable to do anything) and most important, it is true rock/paper/scissors - like somebody else posted, so it means it is totally calculatable outcome, you can do your homework, where in Tekken if your opponent has better movement you cant do shit unless you practice movement and learn to exactly dash the needed amount of distance and buffer a launcher to hit his particular set-up/string. All just frame.