どうせだから seems to occur more when some sort of causality is in place or some
sort of explanation is expected, and it also often appears as a standalone
sentence. And I guess どうせだったら would be more likely to appear as a statement of
condition. But the line seems blurry, considering both are similarly defined
as "might as well", so I wonder if they are interchangeable in some sentences.

>
> しかも、中途半端な男にいって振られるのが嫌だったら、どうせだったらめっちゃいい男にいったほうがいいよね。([source](https://logmi.jp/business/articles/173336))

Can どうせだから be used here? What about どうせなら?
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question
word-choice usage
どうせだったら, どうせなら and どうせだから
I don't think so. In this case,

> しかも、中途半端な男にいって振られるのが嫌だったら、どうせだったらめっちゃいい男にいったほうがいいよね

If you use the どうせだから, it could imply that you're going to be rejected anyway.
Like,

> どうせ（振られるの）だから...

On the other hand, if you use どうせだったら, " _If there is a possibility that you
will be rejected anyway..._ " comes to my mind first (for me personally).
Like,

> どうせ（振られる可能性があるの）だったら...

I think the original sentence was meant to say, " _If you don't want to
confess to a half-baked guy and get rejected, it's still better to confess to
a nice guy and get rejected anyway._ " When I translate it into English like
that, it doesn't seem to make much difference whether if we use "どうせだから" or
"どうせだったら," but when it's in Japanese, I feel required to read the true meaning
between the words, which is a strangely sophisticated thing to do.

I'll leave this answer for now, hoping that others will come up with a more
excellent answer. The answer mine looks more like based on my feeling.
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