Are there engines are especially recommended for strategic/positional analysis? I'm especially looking to use the engine in complex, opening position.
Chess engine is just a tool, your question is like asking which calculator your should use for learning mathematics.
An engine will just give you a score and a computer line, it tells you what you should play but it doesn't tell you what you shouldn't do.
You'll need to work hard, and use the engine to aid your analysis. Consider to pay for a human chess coach.
The engine Komodo is supposed to be renowned for its positional bent, owing to its emphasis on evaluation over depth. GM Simon Williams mentions this in a YouTube video, and this is also reported on the Wikipedia page of the engine.
Unfortunately the engine is proprietary and currently goes for $99.