radiowe r-108 vs tecsun pl-310et

Hello everyone. I have Tecsun pl-310et and I’m very happy with that. I’ve read some encouraging reviews about radiwow r-108, how does it’s sensitivity compare on fm and am to Tecsun ? Some say that it is better, but how come if ferrite antenna in radiwow is shorter than tecsun ? Also I would like to know if on r-108 can you change preset stations with tuning knob (like in tecsun)