AD30VT is a pretty versatile amp. Its warm and responsive. But for heavier stuff, you definitely have to pair it with an overdrive pedal.

Roland Cube30 or Cube30x performs well for most without the need of an overdrive pedal to help boost the output compared to the AD-series, but IMHO, the Cube is less dynamic and warm compared to the AD-series. However, with the JC120 modeller, the cleans on the Cube is definitely superior to the AD-series.

Its all bout what you want from your amp. Want better recommendations, post what are your influences and what songs you intend to play. The more you help us, the more we can help you.