I would recommend applying outland because it is faster. You could see your PR in average 8-9 months. If you apply outland, you have the same opportunities to visit your spouse as any other US citizen so it is up to you if you go to Canada for a while or stay in the US and work. You can not officially move to Canada on visitor status. If you show up with a U-haul at the border, you are asking for trouble. If you want to stay in Canada longer than 6 months, you can ask for a visitor record when you enter. The immigration officer could give you up to a year if they feel like it or at least you have your date of entry registered in case you would like to apply to extend your visitor status.
Applying inland means you would have to stay in Canada. If you left Canada and were for any reason denied entry, you would lose your application. If you applied for an open work permit along with your sponsorship package, you would get it at your first stage approval which is generally after 10-11 months these days but in case it would take longer, you would basically be stuck in Canada without being able to work until you get it. PR with inland usually comes around 9 months after first stage approval so you see, with outland, you have PR even faster than you'd have first stage approval with inland.