Swings & roundabouts. You can't dismiss a pension simply because you are not a higher rate tax payer.
With a pension, you get tax relief on your payments based on the rate of income tax you pay. So for a basic rate tax payer, a £100 payment in to a pension plan will only cost you £80 and HMRC pays the rest. However, when you retire, income from your pension pot is taxable.
Conversely, with an ISA, you don't get any tax relief on your payments - a £100 contribution costs you £100. However, when you use your savings to produce an income, the income is tax free (under current rules).
Both pensions & ISAs grow virtually tax free and their is no CGT on either.
It also depends on how much you are looking to save. With an ISA, the maximum is £10,200 a year, while with a pension, you can contribute up to 100% of your income, subject to the annual allowance of £255k !
Another aspect to consider is how good you are at saving and not touching the money. With the ISA, the capital would be available to you at any time which may be too tempting. With a pension, it can only be used to provide you with an income when you retire (apart from the 25% tax free cash from the pension fund) and you can't take any benefits until you are 55 years old.
How good your 9 years of pensionable service depends on the scheme you were in. If one of the public service schemes, they are 80th schemes, so your pension would be 9/80ths of your final salary.
Either way, it would be worth speaking to an IFA for advice about where to invest. Avoid asking a bank for financial advice.