I have never owned the TCP, so could not say one way or the other. I have owned 4 LCP's and shot the heck out of them. However, I found out later there are much better 380's out there that shoot so much milder and smoother and just better overall quality. I will no longer advise the LCPs. Find a gun built with a stainless steel frame if possible, especially if you plan on shooting frequently. The Pistol will handle better as well.
Of the two LCP's I would advise the LCP Gen2 over the new Model LCP ll.The LCP gen 2 has a much nicer trigger and safer trigger. The safety factor has been a heated debate among LCP owners. That will be your call to make. One major holster maker put out a notice that he will not make a holster for the LCP ll, because he felt it unsafe. I shot the new model and not only felt it unsafe, but just did not like the action of the trigger at all.
One pistol that I think will come into competition with the LCP mass market will be the RM380. Seems to be getting high marks so far. All 7075 aluminum, very easy to rack, safer trigger. It will be one to watch. And it is priced more competitively than the NEW LCP ll. However I have seen the LCP Gen 2 marked down to as low as $179.00