will not be specific for models, but will repeat what some people have already mentioned.
for me, a 2 person tent is my pref (being solo in it) as there is more room to have your panniers in with your and organize your stuff, plus if you take a day off, or wait out rotten weather, its less claustophobic. As mentioned, if you are with a partner that you would be sharing a tent, then splitting up heavy common stuff is even more advantageous with a larger tent (other person can take campstove or whatever if you have tent)
free standing ones are always handy as previously mentioned for setting up on a hard surface, cement, wood, etc. I have set up under shelters or whatever when the weather has been horrible and the campsite didnt mind and/or other times camping with wood platforms.
ditto for holding the tent upside down to get dirt etc out.
All good reasons for a free standing tent. My current tent is not free standing, and although I love it, it is my first non-freestanding tent and I do miss the feature, especially for shaking out when breaking camp.