Tesslas take a while but nothing frys hogs like a tessla. Max those babys up and get ready for the BACON.
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I hang out in Gold II about 1600 Trophies. Have only had hogs hit me twice. I'm upgrading all my troops up to 5 before pushing to high up
If you plan on upgrading your TH really soon and worry you won't get your tesla's done in time because they take so long to upgrade then you may want to start on them, but otherwise the wizard tower is a much better choice. Not only does it do splash damage but it is visible to your opponents which means it acts as a better deterrent than tesla's do.
WT. Teslas don't really get good until lvl6.
WTs first.
10wizards
When I was TH8 I prioritized both wt and tesla and it was a huge help. Again I put a builder on each and a couple on each since I became th9 and wt finished much faster as they did with th8. I finally decided to put a builder on each tesla to finish them to 7 and they are close to finished finally. Both need your devoted attention but i have 5 builders so I could do other important things at the same time.
Currently doing both but have had one builder on teslas pretty much since moving up
I would do Teslas, or you will feel like they never get finished as they can go as high as lv 6 at TH8.
wt since you are th8 but when you get to th10 level 8 teslas should be done as soon as your infernos are done