It seems like "Breeze" is the most recommended one for beginners
Yes, you are right in this one.
I don't want to look back in 12 months time and be like: "Damn, why did I go with X when I fact I should have gone with Y".
If a chosen stack worked fine for 12 months, a need to change is not a planning failure but a refactoring. If it works all and met the needs for so long it was the best choice at the time.
And maybe adding complexity 12 months ago you didn't need on these 12 months would be wasted effort.
"Jetstream" uses "Livewire" (which is good), but, it does NOT use "Bootstrap".
You can easily replace/customize the views included in JetStream with bootstrap tailored ones. The docs even states views are exported during installation so you can customize them.
The views / pages published by Jetstream contain every feature supported by Jetstream and you are free to customize them as needed. Think of Jetstream as a starting point for your application. Once you have installed Jetstream, you are free to customize anything you like.
reference: https://jetstream.laravel.com/2.x/concept-overview.html#views-pages
But in your case, even if using Livewire, I would go with Breeze. It is simpler to understand and to customize.
Choose JetStream when you absolutely required 2fa, built-in user profile, team management, and other more advanced features it provides and that are not present in Breeze.
Choose Breeze when all your need is authentication logic and fewer views to customize.