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Lugs can both pull in more brass/solder and sink more heat, making them harder/slower/expensiver to unpick for mistakes or practice.
Using lugs is easier since you ideally have the tube diameters the lugs were designed for, just need to get the lengths right. You are restricted in terms of both overall geometry and detail geometry, for clearances.
Filleting tubes gives you a lot of freedom, but you'll need to make sure the curves each end are aligned properly. Assuming the ends are correct though, if you get your jig setup wrong (e.g downtube-seattube angle slightly off could result in your toptube and headtube not meeting) you can still separate the tubes and redo earlier joints (assuming you don't overheat a fancy tube and ruin the heat treatment).
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Emyr
Great, whats easiest to start practicing, lugs or fillets?
And as mentioned in the other thread. For home novice practice, a Mapp torch is ok for silver brazing but not brass, and silver is a bit harder to get right, that correct?
What would you suggest to cheaply give it a bash? Not bothered with jigs and angles, just want to actually join two chunks of metal together
Some sort of torch, gas, brazing rod, flux. That it? (in materials, exc safety equipment)