The first tester is hired as as automation engineer. She has spent her career with code and used to identify as programmer. Her previous company moved her from programmer to tester, still programming the tests on a highly technical interface-based system. She approaches testing an automation idea at a time, ticking off test by test to add to her test suite.
The second tester is hired as an exploratory tester. She reads code regularly, but will instinctively approach any testing as a wide scale learning effort, where detail of automation is best used when there first is a good understanding of what we have and how it works.
In a week, the first tester automates one test. The test fails on upcoming weeks as other teams intentionally break functionalities in order to introduce a new feature. The second tester creates one mind map and has lots of conversations that change her understanding of what the state of the feature is supposed to be now, and which of the observations are meaningful.
While the first tester takes tools as they're given, the second tester questions everything. The second tester insists on manually testing in pieces to tweak inputs more easily, and finds ways of breaking down the long chain to run thousands of little tests finding out what kinds of things are relevant. The first tester automates the long chain, until discussing with the second adding the idea of automating in shorter bits, just to realize that it's not as straightforward with automation as you might hope for.
I suspect that over time, you could get to good testing from both of these angles, but it is also evident that there is hardly enough time for the first tester's approach to grow to coverage. The exploratory approach brings long term benefits not through the available test automation, but the improved code and programmer knowledge.
We're lucky to have both. I've been lucky to have the first as something developers do, while the latter has been my assignment.
I'm looking forward to playing more with time boxing my time to be more like tester one and seeing if that makes me more super than I already am with focus on exploration. It is clear that those are, for me, conflicting learning goals and my head just isn't ready on intertwining the two yet. Perhaps in a year.
And the most interesting question of them all: when tester one and two collaborate, from their different starting points, will they become the same? Both are *testers* after all.