The 3410 and 3412 have the same gain (it's the same amplifier inside all the CM34XX amps). The difference in published gain is due to the insertion loss of the internal splitter which is then subtracted from the gain of the amp for those models with an integral splitter.
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There is no advantage to splitting near the antenna after the amp, except for the convenience of coax runs.
The closer the amp is to the antenna the better the results, because the coax loss between the antenna and the amp input subtracts from the antenna gain.
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These two factors are key to your making your decision.
Selecting the distribution amp with the internal splitter does simplify your cabling and makes long term reliability a little (very little, if done properly) more likely as compared to using the external splitter.