The advantage of the Etrade one is it's liquid as DMC said plus you get 250 dollar bonus so the 4% is more like 7. A friend of mine got in it, she accidentally completed it without using the coupon code so she called Etrade and after some transferring around they agreed to honor it anyways so she'll get the 4% for 6 months plus the 250 dollars after 45 days.
I need to move money around to do it and to that I need to be in the US, Etrade was one of the accounts I had trouble accessing even with a VPN last time overseas and I'll be there for several weeks so I am hoping they still have that deal when I get back.
I also agree with DMC it's quite likely the interest rate goes up .25. We have some CD's with Wells Fargo last time we did the 7 month it had the best combination of rate and time, this time we'll do the 4 month to get the higher rate and shorter duration in case the rates go up
I've been doing these things for years it's kind of like arbitrage getting free money. Years ago I had money in a HP Credit Union account even though I didn't work for HP I was eligible because my mom and dad did. HPCU had this insane rule that they paid out a dividend I think quarterly might have been 6 months but you could transfer money in the day of the ex dividend and they would pay out the dividend on the full amount. So you could have 100 dollars in there and then on the last day put in 10K and you'd get a divident as if you had 10,100 dollars for the entire period. My sister actually worked there the ex dividend day was crazy busy with everyone coming in to deposit to get the free money