Hello Ann, it is difficult to guestimate outright what advantages you might experience on Sonic compared to your Willson.... There are so many variables, and so many of them have to do with personal taste. involved.
Rather, so to minimize the impondrables, have you considered giving a call to AustinCustomBrass? ... Talk to Josh..... Ask ACB if they might be able to send you a Sonic on evaluation in your own home.... While some shipping charges might be involved, a trial option might be preferable and less of an anxiety-generator than committing to a purchas outright eyes-closed and wallet-open.
Regards, Guido
M5050L - DC2&3, SM2&4U, BT16, Carbonaria Heavy & New
Wessex EP104 Festivo - available
Carolbrass CCR7772 Bb cornet - Available