If you have enough firepower and nobody is in base or they are distracted by offense, the power node can go down before the beacon is finished when the comm is no pro. Going on the node can be helpful in their main base, because you stop the PG, 2x IP and Arms Lab at the same time. When you go on the obs first, theoreically 3 jetpackers can still come through the PG, 2 people can respawn and the comm can jump out.
A good comm will see it on the mini map and nano shield the node / beacon, or nano shield the obs / beacon. When the comm is using nano shield and beacon a lot, going on the obs will be the better choice.
Depends on how much tech the marines have, what else is happening on the map, how many players are on the server (and thus how many marines can potentially be beaconed), how important the base that you're attacking actually is, how many IPs are there, etc.
In any case, you should start with taking out the 1-2 marines, then go for obs or power. If there are no IPs, I'd go for the pg after the obs, turn it into a meat grinder.
Hmm this really depends on locations of everything. Where are the marines? can u kill them in short time? where is the power, can u die if they beacon? where is the obs and phase gate? If let's say u are attacking terminal in docking, just attack the powernode imo and ignore the marines unless they are very close for a fast kill coz u can easily escape if they beacon because of the location of the powernode. If the powernode is in tricky location like at subsector in summit and theres a good chance u die to beacon i might go marines/obs/phasegate depending on their location.
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A good comm will see it on the mini map and nano shield the node / beacon, or nano shield the obs / beacon. When the comm is using nano shield and beacon a lot, going on the obs will be the better choice.
In any case, you should start with taking out the 1-2 marines, then go for obs or power. If there are no IPs, I'd go for the pg after the obs, turn it into a meat grinder.
I don't know if I'm there to force a beacon or actually try to take out the base. I also don't know the building placement, since bile does splash.