Many molecatchers swear by one type and swear at another.
From meeting and talking to many molecatchers over the years I have come to the conclusion that a molecatchers preference of trap stems from what they were taught to use or learnt to use years ago. Most find it difficult to adapt to using another style of trap, stating they cannot catch moles with other types.
Also the type of ground in the area a molecatcher normally catches will have a bearing on the type of trap that they use.
I use 3 types of mole trap for good reason, so I can catch moles anywhere, in any soil type and any weather condition.
These three traps are:
1. Duffus half-barrel mole trap. Widely available, though there are some terrible, cheap and flimsy imported versions about. Perhaps the most common trap used by professional molecatchers. Light weight to carry, able to catch two moles at once, good for all types of mole run, deep and shallow. Can be difficult to set correctly for new molecatchers and reported to be prone to getting filled with soil by some, but that is operator error and not a trap design fault. Works well everywhere with perhaps the exception of loose soils, but this can be overcome if you know to use them properly.
2. Talpex mole trap. Not freely available, expensive, bulky and heavy but stackable. Exceptionally strong spring making them difficult and dangerous for people with weak or small hands to set, but the most humane mole trap to date. Suitable for all depths of tunnel. Good for wet conditions and loose soils. Not the best trap to use in very hard ground.
3. Scissor mole trap, often call pincher mole trap. This is what most people think of when a mole trap is mentioned. Can pick them up in most garden shops, DIY centres etc. Unfortunately a lot of them are rubbish, with the main concern being weak springs. Even the best scissor traps lag behind the previous two to terms of a humane kill. This trap tends to restrain and squeeze a mole rather than kill it outright. Death can be over a period of hours with weak traps, NOT GOOD. This trap is a favourite of farmers and amateur molecatchers, probably because it is the easiest of all the traps to set. They are bulky and heavy; generally only good for surface runs, and lets everyone know you have put a trap down with the two arms stuck up in the air. At least you can see from a distance if the trap has gone off (so can any one else passing by).
So as you can see there is no trap that is 100% perfect in all conditions, though the Duffus trap comes closest. Any molecatcher just using one type of trap is putting them selves at a disadvantage if they are trapping for a living. If you only go molecatching when the conditions suit your choice of trap, then this is not an issue.
Recently I have seen two completely new styles of mole trap, I’ve not tried them yet, but from the pictures have noticed design flaws in both of them making them only suitable for one type of tunnel and soil condition. The designers must think that molecatchers work in a controlled environment situation where there are no other variable factors to take into account.