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> (1)「元気そうだと田中さんが **いったら** 、信用できる証拠と思う。」
>
> (2) 「元気そうだと田中さんが **いうなら** 、信用できる証拠と思う。」

Are both grammatically correct?

Were I to want to say:

> If Tanaka-san were to say that **X** appears to be in good health, then I
> think that that is evidence that you can trust to be true.

Are both #1 and #2 correct with regard to meaning?  
Which sounds natural?
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2015-08-02T18:29:12.917
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question
word-choice conditionals
conditionals: "...といったら、...." vs. "...というなら、..."?
This seems to be a difference in conditionals (had to look up what subjunctive
mood meant).

たら has the nuance of "if he has said that". Extrapolating from that, the tone
here is like:  
{if this has happened/X has done Y, then "something".}

なら -> というなら here has the nuance of "if **he** says that". More generally, the
tone is:  
{if this is the case/if things are like this/that}

They are both usuable...if I was pressed to say なら feels more subjective and
appropriate if the speaker is highly evaluating the truth-worthiness of that
person, or was previously suspicious of that fact or other witnesses.

たら feels more objective and a reflection of the current situation, and what
the speaker and who they are talking to should do next.
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For example...

> 1) 田中さんがそう言っ **たら** 、信用するよ。  
>  2) 田中さんがそう言う **なら** 、信用するよ。

＃1 means "If Tanaka-san says/said so, I will/would trust that." (Tanaka-san
may or may not say so). ＃2 can mean the same, but it sounds more like "Since
Tanaka-san says so, I trust that." (Tanaka-san actually said that.)
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answer