Hey StarBright,
I teach part time at a local ohio college and am therefore part of the STRS. I don't claim to be an expert by any means so please do your own research and ultimately you have to decide what is best for you. With that said...
I'm not sure what plan you are referring to with the immediate vesting of the 9.5% with Fidelity? I haven't heard of that and it isn't on the STRS website. Please elaborate.
As far as I know, there are three options:
1. defined benefit (pension)
Pros: pensions are backed by the state and you will know exactly what to expect in terms of income in retirement, you also qualify for disability, survivor benefits, healthcare if you put in enough years. No worrying about the stock market. Probably works best if your DH is planning on a long (30 years) career as an ohio teacher and you don't like to manage your investments.
Cons: Laws can change, benefits can be reduced or the retirement age can be extended. If you read the plan summary, this is already happening and the retirement age is getting later. For early retirees, benefits are reduced substantially, I think you need something like 30 or 35 years of service to qualify for full retirement benefits. You don't have any say in asset allocation for your money. Probably the biggest con in my opinion is being at the mercy of the government that can change the rules down the road. 30 years is a long time.
2. defined contribution (403b)
Pros: You pick the investments, you contribute 14% of your salary and they add 9.5%. Index funds are available with low expense ratios. You set the allocation and have control over the investments. If you choose this plan you CAN change your mind in the first 5 years. This is probably best if you plan to retire early and/or plan to change careers before 30 years of service.
Cons: state's portion is fully vested only after 5 years, no survivor benefit, no disability, no health coverage in retirement
3. combination plan (a split between pension and 403b)
Pretty much a split between the two aforementioned options.
I went with the defined contribution plan (#2) because I don't plan on doing this forever and I like managing my own assets, your choice might be different, you need to weigh your options.
I like having control and being able to invest in stock index funds, I also like knowing how much money is in my account at any given time for retirement planning purposes. The pension seems like too much of a black box to me, they take 14% of my salary and then I get some sort of benefit when I'm 60+ which can change between now and then based on what lawmakers decide. Again I'm not an expert but this is what it seems like to me.
I'm curious to hear what other mustachians have to say on this topic. I think pensions are good in theory but given a choice, I'd rather control the funds and invest them in low cost index funds.
Given that you are on this forum, I'm sure you can handle managing your own money just fine and having 23.5% of your salary automatically invested in low-cost index funds is pretty appealing in my opinion. I would go with the defined contribution plan.
Good luck with the choice and just remember, if you pick the defined contribution plan, you can change your mind in the first 5 years.