Watching Bubblegum Crash left me highly disappointed, as it is sub-par in all regards to Bubblegum Crisis. Especially animation quality and sound design are huge downgrades, and it almost feels like the producers tried to make the show somewhat more family friendly. The oppressing atmosphere from Crisis is completely gone, the all-towering Genom tower cannot be seen in any shot at all... it just does not feel true to its prequel.
If you want the complete BGC experience, give this a shot; stay clear otherwise.