In most cases, it depends of your dino lvl, location, dino counts etc. What i want to say is that for someone chainsaw is good if for example you have a lot of harmfull dinos around, but if you are in swamp or near redwood, giga is better option.
Use one Gacha and like 10 snails, just be in the range so that they can work :D, amazing how easy it is to farm it. Be sure to collect from snails also on every 60 minutes.
Or you can just put stone foundation over the tek :D. The thing is, that if someone plays Ark so much, it's more than likely that they will not wait last day to refresh structures, i suppose it would make a lot of problems on PvP
If you are looking of PvE, i would be more than happy to invite you to my server cluster. If you are on Official, i can hook you up with some good dinos to start.