The key is a good race control system and putting the strip/ sensor in the right place.
Get those two right and don't worry about choosing strip or sensor. Just follow the race control system instructions.
The strip/ sensor is best placed on a flat piece of straight not too near the exit of a corner and not near any hills. Don't have them too near where cars commonly deslot - difficult to know if a car came out just before or just after!
There are problems with optical detectors when bits of debris get into the slot, this is easy to fix by cleaning out the slot.
There were problems with guides not being opaque enough for some optical detectors, those somewhat translucent guides don't seem to be in use these days.
The well designed system for dead strips are very reliable, a lot of the problems attributed to dead strips are really system problems, not problems inherent in using a dead strip.
If you are bothered about a few cm. of dead track, split tape rather than dead strips can be used. Most places don't worry about a few cm. of dead track part way down a straight - which if course is where it should be,