Make no mistake, the N75 is the more capable phone, hands down. It is very good at what it does, it will have more bugs and problems at first like any smartphone when it is first released. You can't really compare it to a V3xx since the V3xx is not a smartphone. But, if you need a phone first and a smartphone second the N75 will fit your needs. If you need a solid phone, probably the best that at&t offers, than the V3xx would be your better choice. If all depends on what your needs are. I have a treo 750 and I use it for business, it fits my needs, querty, windows OS. I also switch back and fourth between that and a E62i(yes I have one) just because I love Symbian better. I use the V3xx(Plat) for my everyday phone because it is mindless and problem free, light, built well, sturdy. Basically it fits my needs better for a function as a phone. It also has good multi-media cap. E'mail works very well, and moto phone tools is easy to update my contacts and keep them organized, there are alot of apps for the V3xx to make it function more like a PDA and add them all together, you have a great phone for everyday use.
Is the N75 a better phone, no. Is it a better and more capable device, yes. This is a distinction most people over look. What are your needs? Is it easier to use, no, is the V3xx, yes. I was using the N62i for work and the N75 for everyday use, two smartphones which are great devices, but not great for everyday use. Well, not as easy to use as the V3xx. And when I am not at work, ease of use wins out over "cool' apps and features any day of the week for me.