It depends on whether you want to make the effort required to manage your money. I guess with the L Funds though, it's really almost effortless now. That is unless you want to make even more money. Personally I'm not settling for 4 or 4.3 percent interest rate you get with an annuity. I know I must be doing better than that, although I don't keep track that way. I retired in Jan 2004, have drawn $1K/mo from TPS since I retired and my balance is $6K less than when I started. That's got to be better that 4%/year. If you want to make money leave it in TSP and manage it yourself.
Good Luck
Good Luck