Your senior colleagues likely assess every possibile solution according to multiple criteria.
Those could be:
- some fundamental principles they are trying to follow
- architecture decisions
- easiness of maintainability and testability
- choice of technologies that fit the company ecosystem (or maybe the easiness of acquiring new staff)
- and so on...
There might be multiple reasons where they are coming from. The fundamental question is whether their reasoning is conveyed to you in a manner you can comprehend. Ask extra questions to ensure you really grasp their explanations. Maybe nature of the matters being discussed is so complex verbal communication is not enough. Does any documentation exist to further onboard you to these topics?
If not you can volunteer to start creating one to further aid the knowledge sharing process. The idea here is to show your best intentions that you are really trying to understand their message. Only then you are in a position to challenge their recommendations. Even if that's the case are you doing this in a diplomatic way? If every discussion ends in an argument that's a strong indication something is wrong with your attitude. If you don't agree be polite.
Tricks like "I can see why are you suggesting A and why this could get us to the market quicker, but with a little bit of extra effort doing B we would have great advantage of.. Here's my plan how can we do it ... What do you think guys , does it make any sense?" could help.
You need be humble and be ready to accept they may refuse anyway. That's just life. If those are tiny details at the end of the day those might not even matter, it's way more important you send the right vibe of being a team player. If arguments with those guys are reoccurring theme you put yourself in a really bad place. They will feel they are wasting their energy and feel emotionally drained on pointless (from their perspective) discussions. That's a recipe for a negative bias towards you. You really don't want that.
No matter what, your main goal should be building relations with those guys. They might be wrong sometimes, but it doesn't really matter, they will most likely be there for a long time for better or worse.
Do your best showing attitude of an open minded guy, willing to learn and doing things someone requests even when you are not 100% convinced. The ability to cope with not being right every time might be a valuable lesson to learn. Keep your ego in check.