Deferred Comp Plan

[tophdna]

I just started putting money into my states deferred comp plan. Company matches up to $50/month for first few years of service then it increases.

I chose to allocate the funds to:
BlackRock LifePatch Index 2050 Fund J (a TRF)
Net expense ratio: .17%
Gross expense ratio:.17%
https://www.blackrock.com/investing/products/227845/blackrock-lifepath-index-2050-portfolioinst-cl-fund
I guess that's the link although I don't see fund J tho.

I'm thinking instead after reading some books that I instead should put the money into the BlackRock Total Stock Market Index K
Ticker: BKTSX
Net expense ratio: .03%
Gross expense ratio: .16%
https://www.blackrock.com/investing/products/276539/blackrock-total-stock-index-fund-class-k

Would love your opinions. Should I just simply invest directly in the total stock market and let it ride or stay with the target retirement fund (higher expense ratio). I realize I might get the answer to do maybe 90/10 stock/bond. In that case maybe I could do the total stock market and then put 10 percent into BlackRock US Total Bond Index K (ticker: WFBIX)
https://www.blackrock.com/investing/products/227787/blackrock-bond-index-class-k-fund
 And then of course rebalance one or twice a year.

This is starting out with just 50 bucks a month but once I get married next year we are planning to max contribute to this thing ($18,000/year).

Thoughts?