My favorite is the classic: Magic wand.

I had never gotten off from a vibrator before that thing. My wife had a lot of trouble getting off on her own (I could almost always help), until she got hers.

Now we giggle a little any time we're in a mutual masturbation moment because sometimes there's magic wand vibrations in stereo lol.

The Lovense toys are really nice! I have a lush 1, edge 2, and a gemini. A magic wand with fluttery attachment is very effective but I don't like messing with the controls and having to hold it in place myself. Toys that can do their own thing and don't need my help are so much nicer. So, if we are dreaming here and imagination were the limit, that might be a symbiote?

Small, portable, easily recharged, simple to operate. (Trust me: when I'm getting going, I don't have a lot of attention left to spare for device operation!)

I love this one, but everything by Lelo is so beautiful.

I have a long-discontinued one that's mostly made for fun on the outside, with big ribs that do all the right things to my labia. I have no idea what it's even called, and I've not seen one like it recently, but it's perfect for me.

For the inside, I wish I could find something small and flexible (like two fingers but a bit longer) that could go on a harness, but I gave up looking for that a while back :-/

I have a few, but the one that gets the most use by far is my Womanizer Premium air pulsator. The company's name isn't exactly the best, but the products are very effective. I believe this exact model is discontinued, but there is a newer version available. If the name is too uncomfortable there's also the WeVibe Melt. It's a different brand, but the same company. Just as a disclaimer, I don't personally have a Melt, but it's very highly regarded.

Edit: By the way, the manufacturer is having a big sale right now.

My most used is still the good ol fashioned hitachi magic wand.