In my college search two of my top choices currently are Pomona and MIT. As a recruited athlete I think I have a great shot to get into these schools however I will likely have to make a decision soon. At MIT the coach is very insistent that a degree from MIT is the best “career investment” that I can get and that the access to research opportunities and summer internships is unparalleled. Do you think that attending MIT will really have a noticeable impact on my career and my access to internships and similar opportunities as opposed to attending Pomona or an Ivy school?
Go to Harvey Mudd. You can have both.
IMO it is really a matter of where you feel you will be happiest, most comfortable, and most successful.
What @intparent said!
Being a recruited athlete is one of the best ways to be accepted to a highly selective university. Just remember, it is still not 100%. The data released from Harvard shows an 83% acceptance rate. My understanding is that the coaches at MIT have the lowest pull of any school. So, without any other knowledge about you, your chance would be below the Harvard rate. Still much better than a general candidate. But you should still have a backup plan.
What happy1 said - it depends on your personal interests and where you think you’ll be most comfortable.
Coaches, among other things, are trying to sell their school to recruited athletes. So of course he’s going to tell you that it’s a great career investment to go to MIT. And it is, but it’s not necessarily objectively “better” than going to Pomona.
Sorry folks. Pomona is undoubtably fantastic. It’s near the top of lac food chain. World class and well regarded by those in the know
But Perhaps other than h and s and I would argue perhaps not even h and s have the immediate impact on a global basis than a MIT stem degree. I’m not saying a better education or better PhD outcomes. I am saying he degree speaks for itself before you even speak for yourself.
And all the other qualitative data probably speaks to a fair comparison. But it’s just not the same. MIT is as impressive in Tokyo as it is in California.
If you are interested in Stem, MIT would be a great place to go. As a student athlete I think you would have to investigate Stanford if you have the athletic and academic prowess to compete there. Beautiful weather, top notch sports, terrific academics, lots of internship opportunities. Plus the coach can help you get into Stanford, where the coach at MIT has very little pull.
Is participation in intercollegiate sports important to you? There’s not an easy answer to your Pomona question. I’m not sure what sport you are being recruited for, but Pomona and MIT are D3 schools. Stanford is D1, so they have world class athletes in almost all their programs. Harvey Mudd has the best engineering program and you can take classes there as a Pomona student, but Mudd is teamed up with Claremont McKenna and Scripps.
Kinda assuming track, given the OP’s user name. 
My son is in a similar situation and is also looking at Pomona for a sport. The coach has been in communication with him about an official visit. If you are looking at engineering vs. computer science or math, I’m uncertain that it will work out attending Pomona. We have heard about the 3/2 Engineering program with CalTech. However, it appears that they only accept about 15 total transfer students a year.