I don't normally recommend Strangle or Straddle because there is a BIG Risk involved because normally the Strikes for Strangle / Straddle should be chosen as ITM/ATM. There is no big gain of doing Strangle or Straddle with the OTM strikes. But we can always go for a Combination of Credit Spreads and Straddle OR Debit Spreads and Strangle.
For Example since we are expecting the market to move UP. We can do a Combination of
SELLing 6050PE-6450CE or 6100PE-6450CE
And BUY the 6250CE-6250PE as a Straddle, Which is more or less available at the same premium. The Premium as you see would be 268. And if the VIX does not move as expected then both the pair will be at a loss even if the market moves 100 points.
So it is basically a question of how much risk you want to take ?
The 6250PE-6250CE Straddle, Which was closed around 275 on Friday is now trading at 248 all because of a 15% drop in the VOLT in the early morning trade. So even if the ITM/ATM pairs are not able to give a Good profit in Straddle, then think about the OTM pairs. So in a Trader's market, when the market is showing signs of an UP move, it is better to Sell the pair rather than buying.
So the Rule is very simple
When the market is moving up, DO not Buy - SELL the Pairs - Credit Spreads
When the market is moving down, Buy the Pairs - Debit Spreads