Breakdown of duì tā láishuō, zài gōngyuán sànbù bǐ zài jiā shàngwǎng gèng fàngsōng.
Questions & Answers about duì tā láishuō, zài gōngyuán sànbù bǐ zài jiā shàngwǎng gèng fàngsōng.
对他来说 literally is something like “speaking from his side / from his point of view”.
Functionally, it means “for him / as far as he is concerned / in his opinion”.
- 对 = to, toward, with regard to
- 他 = him
- 来说 = literally “to speak (about it)” but here it has become a fixed expression meaning “from the perspective of …”
So 对他来说,在公园散步比在家上网更放松。 ≈ “For him, walking in the park is more relaxing than surfing the internet at home.”
Sometimes you can, but they’re not always interchangeable.
对他 often means “toward him / to him / for him (in an objective sense)”
- e.g. 我对他很好。 = “I’m nice to him.”
- e.g. 这个工作对他很重要。 = “This job is important to him.”
对他来说 usually means “from his point of view / in his opinion”
- e.g. 对他来说,这个问题不重要。 = “From his point of view, this issue isn’t important.”
In your sentence, we’re talking about his personal feeling about what’s more relaxing, so 对他来说 is the natural choice.
✗ 对他,在公园散步比在家上网更放松。 sounds incomplete and a bit wrong.
You really want 对他来说 here.