The current opinion seems to be that autofocus is of limited utility in closeup and macro photography and may actually be a detriment, since the focus throw of most macro lenses is short. This short throw makes manual focus using the focus ring more difficult since a small movement of the ring causes a large change in focus. However, with the advent of live view and electronic control of focusing, the situation has changed. Autofocus in live view is more accurate than that achieved via the optical viewfinder, since it is achieved through contrast of the image on the sensor. With the optical viewfinder, focus is via phase and depends on accurate alignment of the reflex mirror and autofocus sensor, which is usaully at the bottom of the mirror box.
Electronic control of focus may be achieved in very small steps and the focus throw of the lens is no longer relevant. Live view focusing can be aided through the use of an external monitor. One can use HDMI, a USB connection, or Wi-Fi. Helicon remote implements focus stacking via the USB connection and can be used with a laptop or Android device. One merely chooses near focus by tapping the closest subject area on the screen and the far focus in the same manner. The software automatically takes the required number of shots for the stack. The Camranger also has a focus stacking option.
Various software controllers
are available for Android, iOS devices and laptops. The tablet is more useful in the field than a laptop and may be used via USB or WiFi. Unfortunately, USB is not an option with iOS.
Personally, I would not consider buying a macro lens lacking autofocus. An ultrasonic motor rather than a mechanical autofocus linkage is highly desirable. For Nikon this means an AFS lens and USM for Canon.