Kal-Sharok!

Most well-known cases are Legion during Tali's Recruitment and Loyalty missions, and Javik during Priority: Thessia and Ardat-Yakshi monastery.

 Can you recruit Legion before Tali tho?

I chose Control, because as the Catalyst explains to you, is the only option (apart from Destroy) that will assure you that the reapers will stop and also stop the harvesting cycles. Control will make Shepard's mind to be the new Catalyst (that's how i see it) so the Reapers will do as he says, no more cycles, organics and synthetics get to live, Reapers stays arounds and help species (as Shepard commands). Destroy will stop Reapers and the harvesting BUT will also destroy synthetics, so no EDI and no Geth for ya. Also, as catalyst says, destroying the reapers will doom future for organics, as every cycle the same thing always repeats, organics creates synthetics - synthetics ''evolve'' and start surpassing organics - organics and synthetics start a war because organics feel surpassed by their creations and synthetics can't understand the organics - eventually synthetics win the war, killing the organic live, The Reapers were created so that wouldn't happen, their solution wasn't the best idea, but it worked. Synthesis seems far fetched to me, understanding between organics and synthetics just seems to good to be real, like heaven or some ****, so i don't really count it as a real ending.

Well in my first playtrough i didn't pay any attention to anders and only took him with my party when doing his companion missions. In my second playtrough i always took him with me, i sided with the mages again (i just can't side with Templars, and never did) and having Anders really makes you see the radical point of view of his. O can't say i liked him or disliked him, more like mixed feelings, i think that the mayority selects him because his healing magic.