First off, welcome to the Forum and all the fun. Lots of good folks around here, hope you stick around.
Great choice for a first vape. I'm not sure where you got the idea that Solo II was more powerful or useful, IMO neither is the case. Solo II carries more battery power which means more sessions between charges, the performance wise they're basically the same. Same stems, same heat ranges, same heat up times ('same' oven). Blindfolded it's not possible to tell the difference by what comes out of the stem. Either should serve you well.
The error codes seem to have tapered off if not disappeared. But no doubt about it, that never happened with Solo I, a rock solid unit with years and years of history of reliably delivering vapor. If you want dependability I'd have to say Solo I has it over II, small as that difference might be.
Your call, if it were mine I'd prefer a I at half the cost and buying a
BACKUP VAPE with the difference. A guy should have a second vape to fall back on, prevents Murphy from tossing you the dreaded error codes? I suggest you pick something different and fun to use in it's own right. Vapor Genies, for instance. Or a personal favorite, Vapman. Both are powered by torch type lighters (butane) and are very useful/powerful devices capable of outstanding performance with tiny loads in skilled hands. Very satisfactory.
Also worth considering are VapCap (popular, though I had trouble getting consistent results), MFLB or several others with long threads with happy owners (unlike say Grass Hopper with a long thread of the other kind......).
The idea is not to put yourself in a position where random failure, theft or other loss won't force you back to combustion......even 'just for a little while'.
Therefore I think you should be in the market for two, and encourage you to not dismiss Solo I too quickly. It's earned consideration, and might be more reliable overall than the fancier Solo II. It can do everything Solo II can, just not as many times between reloads. Either will likely serve you well, but you (and everyone else) should have a backup handy, both 'for in case' and 'for instead this time'.
And seriously consider someone like Puff It Up with a strong reputation for Customer Service (should it be needed), also a strong supported of these Forums.
And don't let Member
@ataxian near your glass, he breaks glass a lot you know......gets fan mail from other glass breakers.
Best wishes.
OF