So what are your opinions? I'm not sure about it, I've been playing both.
**** is more of a challenge for the following reasons, and I'm definitely not as good in HC: No radar (unless your team gets kill streaks) and it's a lot easier to get killed. On that note of killing/being killed, does weapon power make a difference? I know it says weapon power is more in HC. I've been killed and killed people so quickly that I'm not sure it really matters what type of weapon you have, as long as you hit first. I've even killed people in HC that in regular TDM I wouldn't even bother shooting at. If my team really sucks, then we'll never get the radar while the other team will always get it.
Regular has it's obvious benefits, including some easy kills

But seriously, in regular TDM, I think your weapon and perks actually make more of a difference. Plus, the loosing team still has a chance to be successful: the radar shows where people are shooting so it gives a chance to all teams. We all know what it's like to join a game when the other team is on a roll.
I left an HC TDM today, it was 3 players to 2 for most of it. One guy on my team was 15-0, I was 2-0 and the other team had 1 kill between them. I was bored and left, unfortunately I was the host, so that guy lost everything. I don't thing he really deserved it though, once one of their players was killed, it became 3-1 and then he got the chopper...