Sight lines aren't that much different, 210 gets you in the "club", an air conditioned area that is great if it is boiling hot or raining, and has slightly fancier food options.
Another potential advantage to the indoor concourse there is shorter lines for restrooms that are generally extremely clean. Especially useful if you get there early and you wind up having to "sit" at some point.
On Friday I made my annual "scout out the parking" trip to the ballpark to see if any of the parking options not run by the team had changed. My preferred spots all remain exactly as they were. That lot down under the Douglass Bridge is still there, but I don't know what the rate will be this year. The block of R Street heading down the hill to get there is still in atrocious condition, so take it slow when turning onto there.
For those of you who have not driven to the ballpark in a while, don't forget there continue to be changes at the 11th Street Bridge as part of the ongoing construction. I believe the new ramps on the Anacostia side of the river were all open last year and the easternmost segment of the Southeast–Southwest Freeway had already closed (the part between the 11th Street Bridge and Pennsylvania Avenue/the tunnel to RFK). The latter is still closed and won't be open during 2014. The ramps between the bridge and the Southeast–Southwest Freeway have been reconfigured and are in much better shape than they used to be—it no longer feels like the road will collapse under your car. However, you may recall there used to be an exit marked "8th Street SE" that brought you down next to the Marine barracks. That exit is gone.
If you are coming from either I-295, DC-295 (Kenilworth Avenue), or Pennsylvania Avenue, and you want to get to M Street SE past the Navy Yard, the best thing to do is to use the new LOCAL span at the 11th Street Bridge and then hang a left onto M Street. If you're coming south on DC-295 (like from US-50 in Maryland or from Pennsylvania Avenue), you take the exit on the right marked for I-695 TO I-395/Capitol Hill, then immediately after the ramp splits off you exit to the left (I don't remember what the sign says) and make a right at the light. If you're coming north up I-295, you stay to the far right after passing South Capitol Street and take the next exit on the right (again, I don't remember what the sign says) and make a left at the light. Just be careful.....there are still a lot of people who seem confused despite the fairly clear big green signs, probably because they're following outdated sat-nav info.