every scene with flash and supergirl

Favourite moment was Barry and Oliver facing off against every else.

and I took it further

I agree with Iris, Oliver is so much hotter when he's on The Flash.
She was saying he's so much hotter now that she knows he's the Green Arrow.

' ' ditto ' '
I love Oliver and Barry together. I agree with Iris, Oliver is so much hotter when he's on The Flash.

Best Moments all scenes btw Stephen Amell and Grant. They both killed it.
I found Oliver's reveal to Barry poignant because it shows how deeply Oliver understands why Barry did exactly what he did. Oliver pretty much said, "I didn't do it because I couldn't."
Oliver standing with Barry also was a great scene because shows just how loyal Oliver is. He's a true leader, even letting Barry take the lead, knowing that Barry doesn't yet have the field experience to lead. It was Oliver still training Barry.

Barry should have replied, "I'm assuming you've cleared Star City of any rogue dark archers then?"

A sneaky great moment.

When Oliver told Barry, "You need help with another evil speedster???"

Diggle vomiting was one of the funniest parts ever on the show. I choose that one.

You think Vamp Lord? but the ending was not that great

When it ended.

It's funny because his best friend went by Captain Cold, which is infinitely more Stupid.

Lol yes. Diggle's always funnier when he's with Team Flash.

Between Mick's name-calling and Digg's reactions to everything, i laughed so hard this episode!

Heat Wave called Supergirl Skirt.

Star Labs often identifies weakspots, sorts out how the villain's powers operate there's often little planning other than that

Yes. And Barry coming up with his own plan, without help from STAR Labs.

he may have said that to give her brownie points but in the race they had in the Supergirl tv series he outdid her quite quickly.

Well it didn't look like it on Supergirl's crossover. In fact in this episode Barry says "Take Supergirl, she's just as fast as me." It wasn't Phasing per se but outthinking the situation what I liked. At no point Supergirl looked to be close to catching up.

Anidrix, Barry's superior speed was determined since Supergirl and Flash had a crossover, Wally's inferior speed is never undeclared, he is said to be faster than Barry when Barry started but not faster than Barry now, and his phasing aint new either
As for the hall of justice Where was it?

Barry confirming he's faster than Wally and Supergirl and ultimately phasing so she'd pass through him to destroy that mind-controlling device.

That was pretty awesome.

yep definitely the hall of justice!