I have a Sticky Brick with the Hydro add-on, a Sticky Brick Junior, several VapCaps, and I used to have an Iolite back in the day. Butane vaporizers are definitely worth considering.
I think my OG Sticky Brick is my favorite vaporizer overall. I get huge, smooth, flavorful hits out of it. It's 100% convection and has a huge chamber so it's great for sessions. It's also possible to microdose with the Brick. Now that the HydroBrick is out that's probably the best option overall as it gives you more flexibility. It's basically a cordless, butane powered Evo.
The VapCap is really good at microdosing and is a very good vaporizer indeed. They work really well with flowers and concentrates. You can't beat the price and size, and the performance is no slouch either. Smooth, fast, and flavorful are also words you could use to describe the VapCap family.
The Iolite is largely obsolete now but it's a perfectly fine and functional vaporizer and I enjoyed it for what it was. There were very few portable vaporizers at the time I bought it, and I found it surprisingly stealthy in use.