not really...the new Techcrunch is putting up a ton more stories...so the TC coverage won't be as useful, since it'll hit the 2nd page within a few hours.
1) Shown to a huge number of people. Their traffic, I'm sure, dwarfs HN's traffic.
2) They have an enormous amount of people subscribed via RSS who will be able to read the news at their leisure.
3) Their stories are also shared via Facebook, Google+, Twitter, you name it.
4) TC articles make their way to HN and Reddit as well, providing additional exposure.
The second page of TechCrunch will still provide you with more than enough eye balls.
This is definitely true. My startup was at the top of the front page on HN for a day or so (a year ago), and that sent us something like 1500 visits. The subsequent TechCrunch writeup garnered something around 5000.