The advantage you gain is uptime, but the disadvantages are fees and pool hoppers. If you mine PPS, there is a fee of 10%, and if you mine Proportional there is a fee of 3% and you will lose out to hoppers.
In regards to Uptime, I believe TripleMining has a very decent uptime, considering how I've never encountered a 404 or read complaints about downtime. So Deepbit has very reputable uptime then? That's something I'll take note of then.
What are the fees over at Deepbit? I couldn't exactly pinpoint the fees. All I know is, at TripleMining, I only lose 1% of my rewards. Not bad I guess? (I wouldn't actually know lol)
What are pool hoppers? Do other miners affect me? I know that I won't be hopping pools, but I don't understand how other pool-hopping miners could affect my rewards.
But this ties in with the fees, huh? This is another thing I don't understand... What I thought it simply was: (Blocks solved by myself) x (0.000002234, or whatever the rate is) = Payout.
Is it really not this simple?
Basically, Deepbit is a well known and respected pool, and have great uptime.
The fees are very large with Deepbit. PPS, Pay Per Share, takes an entire 10% fee per share, so your getting 10% less then you would with a 0% fee pool.
If you mine proportional with Deepbit, there is a 3% fee. The problem with Proportional is Pool Hoppers. Here is a good thread about it, outdated but still gives you an idea about how pool hoppers reduce your income.
https://bitcointalksearch.org/topic/why-is-pool-hopping-a-problem-if-you-use-a-proportional-pool-read-this-24966Different pools have different ways to calculate payouts, for instance Triple mining uses PPLNS, which is a lot like Proportional, but only pay for the last "N" shares instead of all the shares submitted in the round, and in triple mining's case, is the shares submitted in the last 24 hours. There is better explanations of different reward systems on this wiki page, along with other pools:
https://en.bitcoin.it/wiki/Comparison_of_mining_poolsWhat I recommend, you should try to mine at a pool with zero fees. Pools such as EMC and Ozcoin are considered trustworthy. And I just love all the stats and graphs and how organized the MaxBTC pool's website is. Or maybe you should point your 30GH/s at a smaller pool, i'm sure they would welcome you. Lots of pools have threads here:
https://bitcointalk.org/index.php?board=41.0