@Scott A thats your opinion. There's plenty of happy Solo owners. Sometimes it's personal preference. Evidently not everyone has your opinion.
Some people have been happy with the Mighty, it's really expensive for a portable but even that unit has its critics. There isn't a one size fits all.
I agree there are plenty of happy solo owners, but it is definitely not the hardest hitting, quickest high giving vape out there.
That crown for the hardest hitter of the flower vapes sits squarely atop the head of the Sublimator (regardless of the various shortcomings of that vape in other aspects). The Sub just gets you more vaked than any other vaporizer I have ever used (and that is a lot of them now). It is the middle ground between other vapes and just saying 'fuck it' like I did and graduating to dabbing only. I found that even at my heaviest usage (up to 3/4 of a zip a week + more concentrates), the Sub would reliably still get me vaked every time I hit it with flowers. By that stage, my Solo, Crafty, Mighty, E-nano and Vapman took way too long and considerably more material to give me the same effect.
The Solo is definitely a good vape and this is not to say anything negative about it, but I would never describe it as one of the heaviest hitters.
If the OP is looking for a more or less fool proof hard hitting portable, the Mighty best fits that bill so far (but this really does not hit as hard as the sub - of course it isn't a smoulderingly hot branding iron sitting atop your rig either lol).
You can get a number of the butane vapes to hit super hard and get the goods out quickly too, but I personally won't use a vape where there is any chance of accidental combustion these days. If the OP is cool with needing to watch out not to overdo it and combust, then one of these is probably a good place to go next.
Consider making a crude dry sift with your material and hitting bowls of that in the vapman in lieu of flowers too, it will give very hard hits that are still similar to flowers but getting you where you need to be much more quickly, while reducing the chance of combustion. I used to get bigger hits on my vapman with 4 star bubble than I got in the sub!!!!! There is a reason I call that thing the 'Hashman' lol
All you need to make a crude dry sift/kief is a kief box. You can still use the remaining material after sifting in a vape too