How u can compare something what cannot be compared. First problem is u are getting values from totally different days. Second problem is network change every second and now is over 4GH/s hashrate and 64GH diff.
Pool mining u share rewards between all miners. Solo mining u are getting full reward. So usually solo mining giving u more but with current diff its just about luck and with these parameters u will get maybe 150-200 SOIL.
My experience with the soil-miners pool is that I pretty much got rewards for blocks I found, less the pool fee. You just need to look at the stats on the site e.g. I found 601 blocks while mining on there and the total reward was 1775.52985500 of the approx 1803 I would get just mining those 601 blocks..... which is ~98% - now even if you deduct the 1% fee the pool still performs slightly worse than solo mining, but fairly close. This doesn't take into account additional coins from transactions (you should get at least some, but granted not many).
You just need to look at the rewards for the addresses mining..... pretty much finding a share = finding a block on there (certainly while I was mining).