The explorer is a reflector telescope, the evostar is a refractor. The explorer comes with a motor also, but you then ideally need to learn how to roughly polar align then the motor can track to the rotation of the earth. Not hard, but takes a little extra time, rather than plop down the evostar, swing to your target, and view.
Refractors use lenses, a few of them, it’s more expensive to manufacture lenses to a good quality. So more expensive typically or lower quality, small apertures, but generally they are use and forget, you don’t need to do much with them, don’t need to collimate them, at least basically. That’s why you seemingly get less for the money. Reflectors come with their own drawbacks, lenses create chromatic aberration, which can cause image degradation.
The reflectors use mirrors, they are easier and cheaper to produce so you can get bigger mirrors at the equivalent cost reflector basically. So more light gathering for cheaper. But because it relies on bouncing light off a primary mirror, onto a secondary mirror and into the focuses/eyepiece, they have to be calibrated, called collimation for best results.
https://skyandtelescope.org/astronomy-resources/how-to-align-your-newtonian-reflector-telescope/
And thermally, you are relying on light coming through an atmosphere, then into your telescope, viewing quality can be degraded by the air in the reflector, currents, different temperatures etc. Which refractors don’t suffer from as they are sealed. Again, basically you can go into lens sag, thermal expansion etc, etc, but talking basics
I’d have to agree with above, if you had a local astronomy group nearby? Or a store? It can often be easier to figure out how you would get on with the different options.