Plastic or syn?

I decided to purchase my first aneros and the majority of users suggested the helix model.
I also saw some people recommending the syn and others the plastic one: I would like to know the main difference feeling-wise so that I can make a better choice

Wannabe first timer advice

Hi folks, I’ve been trying to get into prostate play since I want to explore my sexuality and maybe bring it into the bedroom with my gf.
I’ve already located my prostate and did a bit of finger play which felt good but didn’t bring me to orgasm because I was too weirded out by the feeling of it.

I’ve been looking aneros’ website and was leaning on trying a helix trident.

Would you suggest trying anything else before buying a toy? Also general suggestion for a beginner is welcome