Help me to buy which Antminer S9 or L3+?

i will donate 48hrs of Cloud mining to best comment when i buy this

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I am not sure whic one to buy because S9 is just $1100 where as L3+ $2100

but the Return fpr L3+ is 45Days while S9 will take 5Months

only thing botthers me that will the Litecoin stay at its current rate of $47 or not

$1099 for S9

$2100 for L3+