I am considering reserves as a 25B. Can you offer advice?

I recommend National Guard early in your career and Reserves later as you may move to different locations or need Sr. level opportunities.
I have 30 years in the KYNG/Army Reserve and three (12 month) combat tours, post 9/11, you should expect to get deployed once every 3-5 years to demonstrate the skills you have acquired.
To be a good 25B, you must be detail oriented to follow specific processes. Technology is not an area that you can skip steps. Pursue if you have the mindset that you will like assisting people with technology, if you don't enjoy this aspect of service, then I don't recommend it.

Bottom line: If you have the aptitude for 25B then, can you discipline yourself to follow a path that many others have followed and achieved success? It is making this decision everyday to focus on work and the skills necessary to execute well.
You can do it, God speed in your pursuits.

Depending on the state I believe you can get higher education benefits as a guardsman, but for everything else USAR is way better. You are federally funded and fall under the federal government. You have better opportunities in promotion, deployment, school, etc.

Reserve 25B training is split into 4 phases, but usually you'll take them all at once. Reservist usually get their MOS training from regional reclass schools across the country. Which means you won't end up in some big AD post with the regular AIT Soldiers. As a reservist you'll be expected to show up once a month and two to four weeks a year, usually in the summer but it can vary. Depending on your unit and leadership you should gets several opportunities to earn IT certs throughout the year. After you finish your 25B training and get a cert or two you should easily be able to find a job.

Succeeding in the reserves is much easier than AD because you only have to put up with the Army BS one weekend a month. As long as you stay in shape, maintain your health readiness, and do your training you should easily be able to rank up and progress. Being in the reserves helps break the monotony of daily work and life but it can get time consuming and annoying at times.

If you don't mind sharing, what is your education level coming from being a 25B? When I left active duty after finishing up my B.S. I was a specialist, and then promoted later. But I later was able to separate after the demands of my position in civilian life out-paced my Military life career, and deployment meant major lifestyle changes (E5 pay, essentially was a third even with combat pay of what I make as a civilian) that I couldn't bring on my family. If you are good in IT, I would recommend seeing a Recruiter and/or a Warrant Officer recruiter before going into the reserves. If you have very little of an IT Background, then going to 25B school in Gordon, will be a great time for you.