Silicone is definitely a good choice if you want to make a long-lasting investment.
It should definitely satisfy your needs as it is a durable, soft, non-porous and very hygienic material.
There is definitely some difference in the various grades of silicone.
This material also makes them much more quiet than the plastic ones.
A majority of them is now waterproof, that makes cleaning convenient or give you a safe option to use them in the shower.
The best ones include Fun Factory (most recommended), Lelo, Marc Dorcel.... all made of anti-allergenic medical grade silicone
Many new models are rechargeable, so that you can always expect a similar level of intensity when using them.
If they are batteries-operated, you can usually expect a motor that is of a higher quality, with better components, that will not break after a few days/weeks of use.
Silicone toys also provide a larger option of shapes and colours, with dual stimulation option (such as the famous top-seller: we-vibe 2 and 3)
or with shapes that are not so obvious/realistic to be more discreet for women who might feel a bit shy when using them with their partner.
This type of sophisticated deluxe products will most certainly satisfy your every need and help you to reach climax with a good quality product. After you selected the right size, you might decide if you want it slim, thick, long or short.
It oviously depends on your anatomy and sensitivity