Jelly is very porous - harboring bacteria which can lead to various health issues. Jelly also has various chemicals that many people have adverse reactions to. The most common symptom is a burning sensation. We've used jelly toys in the past -
...

Jelly is very porous - harboring bacteria which can lead to various health issues. Jelly also has various chemicals that many people have adverse reactions to. The most common symptom is a burning sensation. We've used jelly toys in the past - but my wife has developed a sensitivity to the chemicals - so if we ant to use them we need a condom.

Silicone on the other hand is 'inert' - that is there are no chemicals that you can develop a sensitivity to. They are also considered 'non-porous' meaning it is difficult for bacteria to get a foot hold and grow.

Thorough washing and periodic sanitizing is a good idea. Some use diluted bleach solutions - I prefer alcohol.

EF also has material descriptions;jelly linksilicone link

I've fallen victim to the burning sensation jelly causes me. It sucks because my first toys were jelly.

My choice is silicone above the other choices because, to me, it's superior.

I much prefer silicone for insertable toys, since it is much safer, and so easy to clean and/or sterilize. I would definitely avoid jelly since it is quite porous and (as far as I know) impossible to sterilize. Plastic...eh. I don't prefer it mostly because it isn't environmentally friendly, and I prefer the softer, slightly more 'giving' feel of silicone.