Guitar Amp or Monitors?

Hi, i’m currently using Nolly and Fortin plugins through my guitar amp as the output (Blackstar HT1), i think it sounds very well but im thinking if it would be better to put two studio monitors on the output instead of a guitar amp, something like a presonus eris 3.5 or mackie cr3. There would be a noticeable improvement in sound quality?

Studio monitors will have many advantages over just using the MP3/Line In on your practice amp. Look at it this way: would you mix an entire track using that single Blackstar HT1 speaker or would it sound better on flat response speakers in stereo?