I was in a similar boat I chose the investment route, it is a slower process, but the tax is reduced.

So i have 1.5 million that i want to be 2 million in 6 or 7 years, I can put it in the bank at 4.55% for 5 years or I could invest it in different companies. If I get a term deposit at 4.55% I would lose about half of it due to tax and also my job is 80k a year.