Their are different versions of SDAism all in the same church.
Conservative Adventism. Has a catholic theology and has cultic doctrines
Evangelical Adventism. Beleive the Protestant doctrine of ' righteousness by faith' some still have some watered down cultic beleifs others reject the cultic beleifs altogether.
Liberal Adventists. Christians from all churches have there liberals they are just liberal.
The real differences between the JWs and the SDAs is that different beleifs and groups in the JWs just wouldnt be tollerated. The control the JWs have of there members is unthinkable in the SDAs or other churches.
The SDAs are really quite progressive they have women pastors, have developed their understanding of homosexuals and in a church not far from here we have a member who had a sex change to a women.
SDAs dont disfellowship or mark or shun. Disfellowshipping was voted out at the general conference in 2000.
Ok SDAs do have there nuts more than most one minister once said an SDA couldnt be a policeman but I still dont know why. Some dont beleive they should go to the doctor but when they get sick they allways do.
Im an SDA and I would consider myself in the evangelical group without cultic doctrine.I do have my dissagreements with the church and voice my opinions very clearly at church meetings with no risk of punishment a JW might suffer. I ususally begin by making clear that what I am saying is against church policyand then giving my opinion. In fact a few years ago we had a JW study family join our church they went around all the churches and found they had the most freedom in discussion in the SDAs than any other church.
I dont beleive the SDAs are any better than most mainline churches and if I wasnt an SDA would have no problem in the Anglican or some other church.