Perfect landings? Hah, no!........maybe one or two.
To answer your question, neither!, because you're not going to be doing an approach when there's a thunderstorm at or too near the airport due to the potential for windshear events due to microbursts. While they do have ground based equipment now that can see and detect wind shear the real plan is to avoid those situations in the first place. The ground based detection simply gives you time to break off the approach before you get there.
If you do get into something like that (we practised in the sim and there is an escape manuever), the autopilot will kick off anyway once things really get moving around. The autopilot is limited by its programming for absolute amounts of pitch and roll as well as having rate of change limits. Basically the autopilot is not allowed by the programming to make rapid changes. Windshear will generally produce large changes in airspeed and pitch and the autopilot, due to its limitations, will get so far away from the current set points that it can't correct fast enough and says I'm done and gives the pilots control. This can happen in turbulent cloud tops too.
When it kicks off in cloud tops a non-chalant lady says autopilot...autopilot and now you get to fly for a bit. During approach, as part of the GPWS (or EGPWS) a non-chalant guy says Caution...Windshear (increasing performance, you've hit the headwind part of a microburst) or WINDSHEAR...WINDSHEAR...WINDSHEAR and some red lights (decreasing performane, you've hit the tailwind part of a microburst; a considerably less desirable situation). Now it has been a while and things get fuzzy, but the autopilot may not always kick off during an increasing performance event depending on how dynamic things get.
An autopilot is a very useful tool but a tool nonetheless and has to be used for the right situations. The human mind has the ability to see down the road and be proactive when situations are developing whereas automation is always reacting because inputs have already happened.
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