Custom Lenco L75 vs Technics 1200's

I had a Classic Lenco by Jean Nantais and sold it 7 years ago with no regrets. It was several levels better than the Technics SL-1200 that I had, but it was not as good as my Technics SP10 Mk3. However, my Mk3 is in a custom plinth and I use a Reed tonearm. What I really liked about the Lenco was its sense of weight and scale, but the Mk3 is its equal there. The Mk3 is more refined, quiet, and realistic sounding imo. Perhaps the 1300G would provide a similar upgrade?

Probably best to compare an apple to at least another fruit.  The Mk3, like the SP10R, is in another league from the G series Technics of more modern origin. So those two ought not to be in the discussion.  I only brought up the Mk3 to say I own a Technics. Before that I owned two different SP10 Mk2s, each in a custom plinth. I feel confident that your Lenco, particularly if you add a motor controller, can more than hold its own with a Mk2. Likewise, any G series is superior to any of the offspring of the original SL1200. So comments about the old SL1200/1300, etc, are not relevant. You asked about comparing a G series to your Nantais Lenco.  I think it's a sideways move, and so far as reliability and longevity go, Jean rebuilds his motors and installs many new parts.  The basic Lenco design is at least as old as Direct Drive.  Lenco has a huge and loyal following and there is a plethora of information and help available at Lenco Heaven. So there is nothing to gain as far as reliability by going over to the G series Technics.  As to cost, does not a new Nantais Lenco cost more than even a brand new top line G series?  i would think it compares to any Technics below the SP10R or SL1000R, for cost. 

Sometimes we get a bee in the bonnet to just buy something new. If that is the case here, then you need not ask for advice.  Just go for it.

I appreciate all the good advice here. My Lenco is one of the first Jean built over 15 years ago and I just oil the felt washer and has been going for a long time. The sound is amazing but I like to consider other tables that might not need too much maintenance in the future. That's why I asked how a good Technics would compare. Like someone commented it's good to have more than one table. I am leaning towards a 1300G and keep both to compare. Others mention changing arm and a speed controller but I like the way it sounds now. It's one of the best tables I have heard and I have heard tables and cart. over 40K.

Good that you like the way your Lenco sounds, but a proper motor controller will dramatically enhance speed stability, which you are not monitoring, and that effect I have found to be extremely audible and beneficial, on at least two occasions and in both cases with TTs that I thought were performing well before adding a motor controller.  The Phoenix Engineering gear is no longer manufactured, but you might keep an eye out for a pre-owned example. As Pindac intimated, there may be good ones endorsed by the guys at Lenco Heaven, too. (I am a member but do not keep up with the threads.) And yes, you cannot go wrong by adding a 1300G; I was only saying that it would not necessarily outperform a good Lenco with motor control.

+1 motor controllers can cause a surprising improvement. I use a Walker Precision Motor Controller, Nottingham Analogue Wave Mechanic and SOTA Electronic Flywheel over different systems and can recommend each of them.