But 2007 was a different time. We took one then just before rates dropped like a stone and our mortgage was virtually interest free for about 15 years.
However that was then and this is now. To answer the OPs question, it depends.
You need to compare the tracker rate vs what fixes are available, also what is your lender's SVR. If the tracker is cheaper, it doesn't matter if rates go up a bit, you will be better off, and benefit again if rates fall. However you don't have certainty and there could well be people who took trackers a year or two ago who are now paying rates a lot higher than they started off at.
Take into account the impact of fees. If your mortgage is small, it's often not worth paying a high fee, so it might be worth paying a higher rate, to avoid paying a fee. But if your mortgage is larger, it can be worth paying a large fee, to get a lower rate.
How much do you owe and are there any reasons why tying into a fix even for a couple of years is likely to be expensive, eg you know you will want to move within a year.