I lived in VT for the past 5 years, leading ice for the past 3. I started off climbing in Alphas, then almost exclusively wore leathers (some Raichle 90 Deg EXPs) this past season. I like both, but i have certainly gravitated towards the leathers for day trips pretty heavily.
I like the leather boots because they are (obviously) much more comfortable to hike in, they are lighter, and i have more control of my feet when i climb. Mine kept me warm enough most days last year, and the couple of days when it was old school cold i wore a pair of insulated supergaitors over the boots for a boost in temperature. I found this to be a much more versatile system, and my feet were generally quite a bit happier at the end of the day. I still used my plastics for longer trips (they were key on Katadihn last Feb), where it's essential to be able to take the liner out at night to keep them warm and dry by sleeping with them (well, at least warm).
Just keep in mind that the 3 most important things when buying footwear (especially RIGID footwear) are FIT, FIT and FIT. As long as you figure out the correct type of boot you are looking for, it's my opinion that you should ignore the label on the boot and get the one that fits the best. It's pretty tough to find a poorly made boot from any of the manufacturers listed in this post.
Also, you really didn't say what exactly you will be using the boots for. Make sure you're getting the right boot for what you realisitically will be doing, make sure the salesperson who helps you out isn't trying to upsell you to more boot than you need. If you only intend on general mountaineering in the NE winter, or if you intend on sleeping out in the cold on a regular basis (and good for you if you are!!) then you should probably get some plastics, because that's what they are made for. If you really like sleeping in your bed every single night, and you want to get a bit more vertical, make sure you include some leathers when you are trying boots on. Best of luck, and say hello to Mt. Washington for me this winter.
david