I mostly play large sized Siwa planets that had a high pre-collapse population. I have started trying more hostile environments now I know what I am doing better. I play the default city state start with militia, no councils and low tech.
I'd say that there have been three most interesting starts, other than my first couple of games where I had no idea what to expect. My current game is a blisteringly hot Cerberus planet in the early stages of evolving life, giving me utterly toxic, hostile conditions. The planet was a mining hub and spawned at least one megacity that's some 30+ hexes of ruins around a sea of lava. I started in spitting distance of 3 different major factions with raiders everywhere else, but I was lucky in that my capital was on top of what must have been one of the planet's mining colonies, as I got 3 ruin sites with metal and artifact deposits early on. I'm protected on three sides by mountain ranges that are just big enough for the AI to want to ignore, while not being too much of a nightmare to bypass and route logistics networks around. The changes with diplomacy in the beta have let me pacify and vassalise most of the raiders before they became a problem or the Majors started rolling into their territory. The planet also suffered multiple nuclear exchanges, so is an irradiated husk.
The other two most interesting starts for me were a Limos planet that was a little too warm and a needed filters right up until the colonization phase, when much to my pleasure the game informed me that the planet had been seeded with terran plants, raising the amount of oxygen enough to turn it into a garden world. It then had a relatively peaceful collapse and my biggest problem was the total lack of fuel sources. The other fun one was an Unclassified ball of ice that had blue forests clinging to the mountains, but I got overrun by slavers early on.
Environment suits are too good, they should be nerfed - but that's a different topic.
I agree with this, at the moment I cant see any reason at all not to use an environment suit at the start, regardless of the conditions.