I assume when you say TSM, that's total stock market. If that's an obvious acronym for something else and I'm just missing it, I apologize in advance.
Vanguard's total stock market index fund is comprised of basically 100% domestic stock, split roughly 8 parts large cap, 2 parts mid cap, and 1 part small cap, or 73/18/9 percents, respectively.
Vanguard's target date funds are going to include both US and international stock and US and international bonds, with the US components being larger than international, and stocks initially being larger than bonds but progressively shifting towards bonds over time. Vanguard's 2050 fund is 54% domestic stock, 36% international stock, 7% domestic bonds, and 3% international bonds. The 2020 fund, being closer, is 35% US stock, 28% US bonds, 23% international stock, and 12% international bonds, with another 1% in short term, inflation protected securities. The Target Income Fund, geared towards those already retired, goes even heavier on bonds (55% total) and inflation protected securites (17%), with the remaining 28% in stocks.
So to get to your question of whether you want to invest in it, that will be based on whether you want to be a bit more aggressive than the target date fund. By going total stock, you're increasing risk, but also increasing potential rewards. On the target date side, they're going to ease down your risk factor over the course of time, but the bond component will be a drag on growth when the market is heading up. For me, I don't see the value in being in bonds 30+ years out from retirement, which makes funds such as the target 2050 unpalatable. Your thoughts may differ, and certainly as you get closer to retirement, the relative security of bonds will want to be part of your strategy, and the target funds will manage the transition for you.