50/50 vs 25/25 shouldn't affect ping under normal circumstances, including both round-trip time and packet loss. If it does, it means you're saturating your connection.
The biggest question is actually how much data is going over your wireless connection. When streaming video (presumably to your TV), you'll want that going over a wired connection if possible. Leave the airspace free for your laptop. With even a 25/25 connection, you may be saturating your local wireless before you saturate your Internet, and this is even more true for the 50/50 connection.
If you follow that, then the 25/25 should give identical performance as far as all games go (including FPS), while your wireless is clean and your Internet unsaturated. If you use more bandwidth than that, you need the 50/50. The amount of bandwidth needed for streaming can vary widely, so it's usually easiest just to measure it.
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