Definitely trickle net, very hard wearing but give a bit of loose hay aswell as it can be very frustrating for the horse , they have to work hard to get the hay out so don't tie it high.
They are not really equivalent products. Not tried Martsnets, and I have elim a nets for overnight, which are perfect for what I need, i.e. I want the horse to eat a net full of hay but just slow down a bit. They cope with soaked or wetted hay. They are not the most hard wearing, especially if you don't tie the string 'properly' through the hole at the bottom but I reckon mine last over a year.
Trickle nets were a resounding failure with my horse. He found it so difficult to get the hay out that he gave up, and the net was still full in the morning. Unheard of as he is incredibly food oriented. He was one extremely grumpy boy that day. Not what I wanted to achieve so I sold it online. Quality was really good though, seemed very sturdy and I bet it would last for ages.
Have you had a look at the Freedom Feeder? They are very good.
I like the haywell small holed nets. The holes are bigger (30m instead of 25m) than marts nets and trickle nets but they are still good.
The mesh is soft and they are easy to fill. The trickle nets have quite hard mesh and the greedy feeders had softer mesh but got holes in very quickly and made my pony frustrated and he pulled so hard at them the stable walls moved and kept head butting it to try and loosen up hay, so I am not sure they were very good for his neck/back.
He doesn't pull hard or head butt with the haywell net and they do slow down his eating a lot.
The elim a net unless you have a small pony size have the same size holes as the haywells 30m so not comparable with marts or tricklenets.
Elim a nets do slow them down without being too restrictive, but my boy ruined his after a few months as he's pretty rough with them. Currently trying a shires haylage net which has small holes but a softer material, which also seems to be working although it's made for haylage not hay so not sure if it's a long term option.
Trickle nets are incredible strong and yes quite heavy. I always use one trickle net and one small ordinary net so hungry greedy horses gets a tummy full when she first gets in then has one to slowly eat during the night. She does tug quite hard at it but thats the penalty I have to pay and it better than her having an empty net or getting fat.