Thor
Smash Champion
If a Puff fsmashes my shield (and that happens a lot to me for some reason...), sometimes I punish with grabs, but other times with up+B. If they CC an up+B at like 100% and pushes them offstage, I'll often start charging an arrow, since Puff can't actually go that high [or if she does, release it and nair her back out so she has to rely on pound, which is punishable], and so if I can snipe well, it's a free 18%.
Most dash grabs are laggier [at the end] than JC grabs. JCing doesn't actually speed it up, because most grabs are frame 7 and frame 8 dashing, so you have to go through a frame of jumpsquat to JC it, which means a JC grab is actually the same speed or slower - but less endlag makes it better (and some JC grabs have better range, for instance Marth, though his grab range behind him is better if it is not JC'd). Some characters choose not to JC grab for very good reasons [Samus, Yoshi have less endlag, it makes Peach's CG vs spacies possible, and Bowser's dash grab has bigger range so it is not often JC'd - there may be other examples]. In general, you should JC Link's grab.
For uthrow uair, any DI is better than no DI on the uthrow, but you want to generally DI behind Fox, since he has to turnaround dash and jump into the uair instead of just jumping or dash straight ahead (if I remember correctly, dashing behind is one frame slower). If you can live the uair without DI or can't live it with DI, it's best to try SDI the second hit of the uair to avoid the damage/kill. If you can live the uair with DI, but not without it, you have to decide if avoiding ~9% is worth risking the whole stock - I don't think it is personally (and being up high then can give you a shot to pull a bomb on the way down). At low percents if the Fox isn't quick you can nair out of it as Link's combo breaker option, but if they see this option they can just usmash you as you land, so be wary of doing this [you've been warned].
Most dash grabs are laggier [at the end] than JC grabs. JCing doesn't actually speed it up, because most grabs are frame 7 and frame 8 dashing, so you have to go through a frame of jumpsquat to JC it, which means a JC grab is actually the same speed or slower - but less endlag makes it better (and some JC grabs have better range, for instance Marth, though his grab range behind him is better if it is not JC'd). Some characters choose not to JC grab for very good reasons [Samus, Yoshi have less endlag, it makes Peach's CG vs spacies possible, and Bowser's dash grab has bigger range so it is not often JC'd - there may be other examples]. In general, you should JC Link's grab.
For uthrow uair, any DI is better than no DI on the uthrow, but you want to generally DI behind Fox, since he has to turnaround dash and jump into the uair instead of just jumping or dash straight ahead (if I remember correctly, dashing behind is one frame slower). If you can live the uair without DI or can't live it with DI, it's best to try SDI the second hit of the uair to avoid the damage/kill. If you can live the uair with DI, but not without it, you have to decide if avoiding ~9% is worth risking the whole stock - I don't think it is personally (and being up high then can give you a shot to pull a bomb on the way down). At low percents if the Fox isn't quick you can nair out of it as Link's combo breaker option, but if they see this option they can just usmash you as you land, so be wary of doing this [you've been warned].