I find valks to be very good troops. For wars anyways. They are very tanky, good splash damage, and better speed.
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I could have used that information about two hours ago lol XD before I attacked in war
I´m someone who started to ignore those dumb and expensive Dragons since nearly I had them ;)
With TH 7you can go with Hogs or Giants/Wizards.
With TH 8 you have plenty of possibillities! You have Hogs/Gowipe/Gowiva/GiWi/HoLo/HoWi...
A very powerful atrategy are Hogs/Wizards! With Lv 1 and 2 Hogs you´ll only able to 3-star those bases where you can be 100% sure that the Giant Bombs are outside of the village! Lv 1 Hogs get killed with every Giant Bomb, the Lv 2 Hogs will have 12HP after dropping a Lv 2 Giant Bomb...
But if you face such a village with no Giant Bombs in there, use 27-30 Hogs, rest Wizards! Very Important: Luring CC!! and to heal the hogs early.
With lv 3 Hogs you´ll be able to attack also those villages where a Giant Bomb could be in the village(but not Double Giant Bomb!). Get them to lv 4 and you´ll have a very easy job! I have lv 3 Hogs atm, and make 3-stars with them nearly everytime, but I´m very used to them, couzld make a difference.
The next strategy which I´m very used to it and I usually make 3 stars with it is Gowiva!
In my opinion it´s more powerful than Gowipe, because the Valkyries are faster than the Pekka and a bit easier to control(a lot of Gowipe-attacks fail because the Pekka is going around the village and not inside).
Usually I take 2 Golem/7-9 Valkyries/3-4 Wallbreakers/Rest Wizards. And depending on the village I attack some barbs/ 1 giant/ 1-2 Hogs to lure the CC out.
But luring CC is not that important than it is by using hogs! Valkyries and Wizards are strong attackers, able to knock the CC-troops out.
For GoWiVa, set you Golems first with the Wall-Breakers to get the golems in, than some wizards who clear the buildings outside the village. That is the important thing, because otherwise the Valkyries will go around the village not in! You want them to go with the Golems inside the village!
The Wizards will follow the Golems/Valkyries to destroy the village. Use 2 Heal, one Rage spell for this strategy!
One member of our Clan is only used to Dragons, but the last 3 Wars he wasn´t able to 3-star the bases anymore, because the AD and the Rest of his opponents got stronger and stronger. I showed him some of my GoWiva attacks and yesterday he tried this strategy for his first time in a War and he got immediately 2 stars with 93% destroyed.
You have to train Gowiva a bit, but as soon as you are used to it, you´ll be even more successfull than with Gowipe. With Gowipe it always can happen that the Pekka is making anything dumb, and since you have only 2 of them, this affects your attack so much. With Gowiva, you have 7-9 Valkyries attacking, if one of them makes something dumb suddenly, you don´t have to care about it.
I use Gowiva when I can´t use Hogs(usually when there could be a Double Giant Bomb in the village for example).
I suggest to you to try those strategys first in multiplayer before you use it in the War, so you know how those troops react and so on.
Edit: In the last few wars I got used to substitute one Golem with 10 Giants for example, so you have more attacking power for taking out the defense. It´s a bit stronger than the normal Gowiva, but also more vulnerable on how the giants will go. If 5 of the suddenly decide to walk another trail than the others, things get more difficult.
That is something you could try with some multiplayer-attacks, so you can explore what fits best for you! :)