Distance from Disney is pretty similar. The resorts are 2 miles apart as the crow flies. Vistana Resort has great access to the parks via World Center Drive. Maybe one or two more traffic lights than from WBC.
The resort styles are very different. WBC is a cluster of tall hotel style buildings with inside corridors and large surface lots. SVR is a villa type resort with a couple of hundred(ish) buildings on 135 acres. Parking in most sections is at or near your door. There are no inner corridors. Buildings are 2 to 5 stories high, with elevators in buildings over 3 stories (Lakes and Cascades sections). Anytime i have seen the two compared it is the building configuration that seems to make the biggest difference. Vistana does not have any 3BR configuration villas.
I like the space that Vistana offers and the amenities and dining options are to our liking. Vistana does not have a pirate ship or lazy river. Vistana has 7 pools of varying sizes. That means there is generally something for everyone. We are March break travelers and can find a quiet pool for adults, safer pools for smaller kids, and active pools for teens. Vistana also has lots of (13) tennis courts, basketball courts, play areas, beach volleyball courts, shuffleboard, and mini-putt.
From a quality perspective, I can't compare the two directly - we own at Vistana and Silver Lake so have never needed to stay elsewhere in Orlando - but we have stayed at several Wyndham timeshares elsewhere in the US and I would say that Sheraton is a cut above Wyndham on the whole. Actually the Wyndhams I have stayed at remind me more of Silver Lake for quality. Quality is highly subjective, and to me that is usually about fit and finish, bedding and linen quality, things like that. I have had exemplary (and lousy) service at both timeshare chains so I don't put that into my rating quite as much (any worker can be having a bad day).
To answer "should we try it" I can only say yes, if you think the differences won't bother you and you are open to trying something new. We love Vistana and it feels like home to us. Sounds to me like WBC feels like home to you. Vistana IS going to different from that. Not bad different, but different.