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A 120mm scope collects 44% more light than a 100mm . Taks are always given mystical properties that they can transcend the laws of physics - they can't .
In these sizes for visual you do not need flourite glass - my Orion 120mm F7.5 Epoch shows absolutely no visual colour . It is not really grab,n,go as you need to move it around in the case which is about 13kg all up.
All that being said 120mm is not enough light gathering for any level of satisfying visual observing , bar a look at the Moon or a bright star cluster . Put and off axis- 120mm hole in front of your 12" dob and see how fast you lose interest !
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